diff --git a/material/assets/javascripts/application.24b6416b.js b/material/assets/javascripts/application.24b6416b.js
new file mode 100644
index 000000000..7b9435e75
--- /dev/null
+++ b/material/assets/javascripts/application.24b6416b.js
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RegExp("^"+r+n+"[^aeiouwxy]$"),v=/^(.+?[^aeiou])y$/,y=/^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/,g=/^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/,w=/^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/,_=/^(.+?)(s|t)(ion)$/,E=/^(.+?)e$/,x=/ll$/,k=new RegExp("^"+r+n+"[^aeiouwxy]$"),b=function(n){var r,b,T,S,L,C,M;if(n.length<3)return n;if(T=n.substr(0,1),"y"==T&&(n=T.toUpperCase()+n.substr(1)),S=c,L=u,S.test(n)?n=n.replace(S,"$1$2"):L.test(n)&&(n=n.replace(L,"$1$2")),S=l,L=d,S.test(n)){var O=S.exec(n);S=i,S.test(O[1])&&(S=f,n=n.replace(S,""))}else if(L.test(n)){var O=L.exec(n);r=O[1],L=s,L.test(r)&&(n=r,L=h,C=p,M=m,L.test(n)?n+="e":C.test(n)?(S=f,n=n.replace(S,"")):M.test(n)&&(n+="e"))}if(S=v,S.test(n)){var O=S.exec(n);r=O[1],n=r+"i"}if(S=y,S.test(n)){var O=S.exec(n);r=O[1],b=O[2],S=i,S.test(r)&&(n=r+e[b])}if(S=g,S.test(n)){var O=S.exec(n);r=O[1],b=O[2],S=i,S.test(r)&&(n=r+t[b])}if(S=w,L=_,S.test(n)){var O=S.exec(n);r=O[1],S=o,S.test(r)&&(n=r)}else if(L.test(n)){var O=L.exec(n);r=O[1]+O[2],L=o,L.test(r)&&(n=r)}if(S=E,S.test(n)){var O=S.exec(n);r=O[1],S=o,L=a,C=k,(S.test(r)||L.test(r)&&!C.test(r))&&(n=r)}return S=x,L=o,S.test(n)&&L.test(n)&&(S=f,n=n.replace(S,"")),"y"==T&&(n=T.toLowerCase()+n.substr(1)),n};return function(e){return e.update(b)}}(),o.Pipeline.registerFunction(o.stemmer,"stemmer"),o.generateStopWordFilter=function(e){var t=e.reduce(function(e,t){return e[t]=t,e},{});return function(e){if(e&&t[e.toString()]!==e.toString())return e}},o.stopWordFilter=o.generateStopWordFilter(["a","able","about","across","after","all","almost","also","am","among","an","and","any","are","as","at","be","because","been","but","by","can","cannot","could","dear","did","do","does","either","else","ever","every","for","from","get","got","had","has","have","he","her","hers","him","his","how","however","i","if","in","into","is","it","its","just","least","let","like","likely","may","me","might","most","must","my","neither","no","nor","not","of","off","often","on","only","or","other","our","own","rather","said","say","says","she","should","since","so","some","than","that","the","their","them","then","there","these","they","this","tis","to","too","twas","us","wants","was","we","were","what","when","where","which","while","who","whom","why","will","with","would","yet","you","your"]),o.Pipeline.registerFunction(o.stopWordFilter,"stopWordFilter"),o.trimmer=function(e){return e.update(function(e){return e.replace(/^\W+/,"").replace(/\W+$/,"")})},o.Pipeline.registerFunction(o.trimmer,"trimmer"),o.TokenSet=function(){this.final=!1,this.edges={},this.id=o.TokenSet._nextId,o.TokenSet._nextId+=1},o.TokenSet._nextId=1,o.TokenSet.fromArray=function(e){for(var t=new o.TokenSet.Builder,n=0,r=e.length;n<r;n++)t.insert(e[n]);return t.finish(),t.root},o.TokenSet.fromClause=function(e){return"editDistance"in e?o.TokenSet.fromFuzzyString(e.term,e.editDistance):o.TokenSet.fromString(e.term)},o.TokenSet.fromFuzzyString=function(e,t){for(var n=new o.TokenSet,r=[{node:n,editsRemaining:t,str:e}];r.length;){var i=r.pop();if(i.str.length>0){var a,s=i.str.charAt(0);s in i.node.edges?a=i.node.edges[s]:(a=new o.TokenSet,i.node.edges[s]=a),1==i.str.length?a.final=!0:r.push({node:a,editsRemaining:i.editsRemaining,str:i.str.slice(1)})}if(i.editsRemaining>0&&i.str.length>1){var c,s=i.str.charAt(1);s in i.node.edges?c=i.node.edges[s]:(c=new o.TokenSet,i.node.edges[s]=c),i.str.length<=2?c.final=!0:r.push({node:c,editsRemaining:i.editsRemaining-1,str:i.str.slice(2)})}if(i.editsRemaining>0&&1==i.str.length&&(i.node.final=!0),i.editsRemaining>0&&i.str.length>=1){if("*"in i.node.edges)var u=i.node.edges["*"];else{var u=new o.TokenSet;i.node.edges["*"]=u}1==i.str.length?u.final=!0:r.push({node:u,editsRemaining:i.editsRemaining-1,str:i.str.slice(1)})}if(i.editsRemaining>0){if("*"in i.node.edges)var l=i.node.edges["*"];else{var l=new o.TokenSet;i.node.edges["*"]=l}0==i.str.length?l.final=!0:r.push({node:l,editsRemaining:i.editsRemaining-1,str:i.str})}if(i.editsRemaining>0&&i.str.length>1){var d,f=i.str.charAt(0),h=i.str.charAt(1);h in i.node.edges?d=i.node.edges[h]:(d=new o.TokenSet,i.node.edges[h]=d),1==i.str.length?d.final=!0:r.push({node:d,editsRemaining:i.editsRemaining-1,str:f+i.str.slice(2)})}}return n},o.TokenSet.fromString=function(e){for(var t=new o.TokenSet,n=t,r=!1,i=0,a=e.length;i<a;i++){var s=e[i],c=i==a-1;if("*"==s)r=!0,t.edges[s]=t,t.final=c;else{var u=new o.TokenSet;u.final=c,t.edges[s]=u,t=u,r&&(t.edges["*"]=n)}}return n},o.TokenSet.prototype.toArray=function(){for(var e=[],t=[{prefix:"",node:this}];t.length;){var n=t.pop(),r=Object.keys(n.node.edges),i=r.length;n.node.final&&e.push(n.prefix);for(var o=0;o<i;o++){var a=r[o];t.push({prefix:n.prefix.concat(a),node:n.node.edges[a]})}}return e},o.TokenSet.prototype.toString=function(){if(this._str)return this._str;for(var e=this.final?"1":"0",t=Object.keys(this.edges).sort(),n=t.length,r=0;r<n;r++){var i=t[r];e=e+i+this.edges[i].id}return e},o.TokenSet.prototype.intersect=function(e){for(var t=new o.TokenSet,n=void 0,r=[{qNode:e,output:t,node:this}];r.length;){n=r.pop();for(var i=Object.keys(n.qNode.edges),a=i.length,s=Object.keys(n.node.edges),c=s.length,u=0;u<a;u++)for(var l=i[u],d=0;d<c;d++){var f=s[d];if(f==l||"*"==l){var h=n.node.edges[f],p=n.qNode.edges[l],m=h.final&&p.final,v=void 0;f in n.output.edges?(v=n.output.edges[f],v.final=v.final||m):(v=new o.TokenSet,v.final=m,n.output.edges[f]=v),r.push({qNode:p,output:v,node:h})}}}return t},o.TokenSet.Builder=function(){this.previousWord="",this.root=new o.TokenSet,this.uncheckedNodes=[],this.minimizedNodes={}},o.TokenSet.Builder.prototype.insert=function(e){var t,n=0;if(e<this.previousWord)throw new Error("Out of order word insertion");for(var r=0;r<e.length&&r<this.previousWord.length&&e[r]==this.previousWord[r];r++)n++;this.minimize(n),t=0==this.uncheckedNodes.length?this.root:this.uncheckedNodes[this.uncheckedNodes.length-1].child;for(var r=n;r<e.length;r++){var i=new o.TokenSet,a=e[r];t.edges[a]=i,this.uncheckedNodes.push({parent:t,char:a,child:i}),t=i}t.final=!0,this.previousWord=e},o.TokenSet.Builder.prototype.finish=function(){this.minimize(0)},o.TokenSet.Builder.prototype.minimize=function(e){for(var t=this.uncheckedNodes.length-1;t>=e;t--){var n=this.uncheckedNodes[t],r=n.child.toString();r in this.minimizedNodes?n.parent.edges[n.char]=this.minimizedNodes[r]:(n.child._str=r,this.minimizedNodes[r]=n.child),this.uncheckedNodes.pop()}},o.Index=function(e){this.invertedIndex=e.invertedIndex,this.fieldVectors=e.fieldVectors,this.tokenSet=e.tokenSet,this.fields=e.fields,this.pipeline=e.pipeline},o.Index.prototype.search=function(e){return this.query(function(t){new o.QueryParser(e,t).parse()})},o.Index.prototype.query=function(e){var t=new o.Query(this.fields),n=Object.create(null),r=Object.create(null),i=Object.create(null);e.call(t,t);for(var a=0;a<t.clauses.length;a++){var s=t.clauses[a],c=null;c=s.usePipeline?this.pipeline.runString(s.term):[s.term];for(var u=0;u<c.length;u++){var l=c[u];s.term=l;for(var d=o.TokenSet.fromClause(s),f=this.tokenSet.intersect(d).toArray(),h=0;h<f.length;h++)for(var p=f[h],m=this.invertedIndex[p],v=m._index,y=0;y<s.fields.length;y++){var g=s.fields[y],w=m[g],_=Object.keys(w),E=p+"/"+g;if(void 0===r[g]&&(r[g]=new o.Vector),r[g].upsert(v,1*s.boost,function(e,t){return e+t}),!i[E]){for(var x=0;x<_.length;x++){var k,b=_[x],T=new o.FieldRef(b,g),S=w[b];void 0===(k=n[T])?n[T]=new o.MatchData(p,g,S):k.add(p,l,S)}i[E]=!0}}}}for(var L=Object.keys(n),C=[],M=Object.create(null),a=0;a<L.length;a++){var O,R=o.FieldRef.fromString(L[a]),A=R.docRef,P=this.fieldVectors[R],I=r[R.fieldName].similarity(P);if(void 0!==(O=M[A]))O.score+=I,O.matchData.combine(n[R]);else{var N={ref:A,score:I,matchData:n[R]};M[A]=N,C.push(N)}}return C.sort(function(e,t){return t.score-e.score})},o.Index.prototype.toJSON=function(){var e=Object.keys(this.invertedIndex).sort().map(function(e){return[e,this.invertedIndex[e]]},this),t=Object.keys(this.fieldVectors).map(function(e){return[e,this.fieldVectors[e].toJSON()]},this);return{version:o.version,fields:this.fields,fieldVectors:t,invertedIndex:e,pipeline:this.pipeline.toJSON()}},o.Index.load=function(e){var t={},n={},r=e.fieldVectors,i={},a=e.invertedIndex,s=new o.TokenSet.Builder,c=o.Pipeline.load(e.pipeline);e.version!=o.version&&o.utils.warn("Version mismatch when loading serialised index. Current version of lunr '"+o.version+"' does not match serialized index '"+e.version+"'");for(var u=0;u<r.length;u++){var l=r[u],d=l[0],f=l[1];n[d]=new o.Vector(f)}for(var u=0;u<a.length;u++){var l=a[u],h=l[0],p=l[1];s.insert(h),i[h]=p}return s.finish(),t.fields=e.fields,t.fieldVectors=n,t.invertedIndex=i,t.tokenSet=s.root,t.pipeline=c,new o.Index(t)},o.Builder=function(){this._ref="id",this._fields=[],this.invertedIndex=Object.create(null),this.fieldTermFrequencies={},this.fieldLengths={},this.tokenizer=o.tokenizer,this.pipeline=new o.Pipeline,this.searchPipeline=new o.Pipeline,this.documentCount=0,this._b=.75,this._k1=1.2,this.termIndex=0,this.metadataWhitelist=[]},o.Builder.prototype.ref=function(e){this._ref=e},o.Builder.prototype.field=function(e){this._fields.push(e)},o.Builder.prototype.b=function(e){this._b=e<0?0:e>1?1:e},o.Builder.prototype.k1=function(e){this._k1=e},o.Builder.prototype.add=function(e){var t=e[this._ref];this.documentCount+=1;for(var n=0;n<this._fields.length;n++){var r=this._fields[n],i=e[r],a=this.tokenizer(i),s=this.pipeline.run(a),c=new o.FieldRef(t,r),u=Object.create(null);this.fieldTermFrequencies[c]=u,this.fieldLengths[c]=0,this.fieldLengths[c]+=s.length;for(var l=0;l<s.length;l++){var d=s[l];if(void 0==u[d]&&(u[d]=0),u[d]+=1,void 0==this.invertedIndex[d]){var f=Object.create(null);f._index=this.termIndex,this.termIndex+=1;for(var h=0;h<this._fields.length;h++)f[this._fields[h]]=Object.create(null);this.invertedIndex[d]=f}void 0==this.invertedIndex[d][r][t]&&(this.invertedIndex[d][r][t]=Object.create(null));for(var p=0;p<this.metadataWhitelist.length;p++){var m=this.metadataWhitelist[p],v=d.metadata[m];void 0==this.invertedIndex[d][r][t][m]&&(this.invertedIndex[d][r][t][m]=[]),this.invertedIndex[d][r][t][m].push(v)}}}},o.Builder.prototype.calculateAverageFieldLengths=function(){for(var e=Object.keys(this.fieldLengths),t=e.length,n={},r={},i=0;i<t;i++){var a=o.FieldRef.fromString(e[i]),s=a.fieldName;r[s]||(r[s]=0),r[s]+=1,n[s]||(n[s]=0),n[s]+=this.fieldLengths[a]}for(var i=0;i<this._fields.length;i++){var s=this._fields[i];n[s]=n[s]/r[s]}this.averageFieldLength=n},o.Builder.prototype.createFieldVectors=function(){for(var e={},t=Object.keys(this.fieldTermFrequencies),n=t.length,r=Object.create(null),i=0;i<n;i++){for(var a=o.FieldRef.fromString(t[i]),s=a.fieldName,c=this.fieldLengths[a],u=new o.Vector,l=this.fieldTermFrequencies[a],d=Object.keys(l),f=d.length,h=0;h<f;h++){var p,m,v,y=d[h],g=l[y],w=this.invertedIndex[y]._index;void 0===r[y]?(p=o.idf(this.invertedIndex[y],this.documentCount),r[y]=p):p=r[y],m=p*((this._k1+1)*g)/(this._k1*(1-this._b+this._b*(c/this.averageFieldLength[s]))+g),v=Math.round(1e3*m)/1e3,u.insert(w,v)}e[a]=u}this.fieldVectors=e},o.Builder.prototype.createTokenSet=function(){this.tokenSet=o.TokenSet.fromArray(Object.keys(this.invertedIndex).sort())},o.Builder.prototype.build=function(){return this.calculateAverageFieldLengths(),this.createFieldVectors(),this.createTokenSet(),new o.Index({invertedIndex:this.invertedIndex,fieldVectors:this.fieldVectors,tokenSet:this.tokenSet,fields:this._fields,pipeline:this.searchPipeline})},o.Builder.prototype.use=function(e){var t=Array.prototype.slice.call(arguments,1);t.unshift(this),e.apply(this,t)},o.MatchData=function(e,t,n){for(var r=Object.create(null),i=Object.keys(n),o=0;o<i.length;o++){var a=i[o];r[a]=n[a].slice()}this.metadata=Object.create(null),this.metadata[e]=Object.create(null),this.metadata[e][t]=r},o.MatchData.prototype.combine=function(e){for(var t=Object.keys(e.metadata),n=0;n<t.length;n++){var r=t[n],i=Object.keys(e.metadata[r]);void 0==this.metadata[r]&&(this.metadata[r]=Object.create(null));for(var o=0;o<i.length;o++){var a=i[o],s=Object.keys(e.metadata[r][a]);void 0==this.metadata[r][a]&&(this.metadata[r][a]=Object.create(null));for(var c=0;c<s.length;c++){var u=s[c];void 0==this.metadata[r][a][u]?this.metadata[r][a][u]=e.metadata[r][a][u]:this.metadata[r][a][u]=this.metadata[r][a][u].concat(e.metadata[r][a][u])}}}},o.MatchData.prototype.add=function(e,t,n){if(!(e in this.metadata))return this.metadata[e]=Object.create(null),void(this.metadata[e][t]=n);if(!(t in this.metadata[e]))return void(this.metadata[e][t]=n);for(var r=Object.keys(n),i=0;i<r.length;i++){var o=r[i];o in this.metadata[e][t]?this.metadata[e][t][o]=this.metadata[e][t][o].concat(n[o]):this.metadata[e][t][o]=n[o]}},o.Query=function(e){this.clauses=[],this.allFields=e},o.Query.wildcard=new String("*"),o.Query.wildcard.NONE=0,o.Query.wildcard.LEADING=1,o.Query.wildcard.TRAILING=2,o.Query.prototype.clause=function(e){return"fields"in e||(e.fields=this.allFields),"boost"in e||(e.boost=1),"usePipeline"in e||(e.usePipeline=!0),"wildcard"in e||(e.wildcard=o.Query.wildcard.NONE),e.wildcard&o.Query.wildcard.LEADING&&e.term.charAt(0)!=o.Query.wildcard&&(e.term="*"+e.term),e.wildcard&o.Query.wildcard.TRAILING&&e.term.slice(-1)!=o.Query.wildcard&&(e.term=e.term+"*"),this.clauses.push(e),this},o.Query.prototype.term=function(e,t){var n=t||{};return n.term=e,this.clause(n),this},o.QueryParseError=function(e,t,n){this.name="QueryParseError",this.message=e,this.start=t,this.end=n},o.QueryParseError.prototype=new Error,o.QueryLexer=function(e){this.lexemes=[],this.str=e,this.length=e.length,this.pos=0,this.start=0,this.escapeCharPositions=[]},o.QueryLexer.prototype.run=function(){for(var e=o.QueryLexer.lexText;e;)e=e(this)},o.QueryLexer.prototype.sliceString=function(){for(var e=[],t=this.start,n=this.pos,r=0;r<this.escapeCharPositions.length;r++)n=this.escapeCharPositions[r],e.push(this.str.slice(t,n)),t=n+1;return e.push(this.str.slice(t,this.pos)),this.escapeCharPositions.length=0,e.join("")},o.QueryLexer.prototype.emit=function(e){this.lexemes.push({type:e,str:this.sliceString(),start:this.start,end:this.pos}),this.start=this.pos},o.QueryLexer.prototype.escapeCharacter=function(){this.escapeCharPositions.push(this.pos-1),this.pos+=1},o.QueryLexer.prototype.next=function(){if(this.pos>=this.length)return o.QueryLexer.EOS;var e=this.str.charAt(this.pos);return this.pos+=1,e},o.QueryLexer.prototype.width=function(){return this.pos-this.start},o.QueryLexer.prototype.ignore=function(){this.start==this.pos&&(this.pos+=1),this.start=this.pos},o.QueryLexer.prototype.backup=function(){this.pos-=1},o.QueryLexer.prototype.acceptDigitRun=function(){var e,t;do{e=this.next(),t=e.charCodeAt(0)}while(t>47&&t<58);e!=o.QueryLexer.EOS&&this.backup()},o.QueryLexer.prototype.more=function(){return this.pos<this.length},o.QueryLexer.EOS="EOS",o.QueryLexer.FIELD="FIELD",o.QueryLexer.TERM="TERM",o.QueryLexer.EDIT_DISTANCE="EDIT_DISTANCE",o.QueryLexer.BOOST="BOOST",o.QueryLexer.lexField=function(e){return e.backup(),e.emit(o.QueryLexer.FIELD),e.ignore(),o.QueryLexer.lexText},o.QueryLexer.lexTerm=function(e){if(e.width()>1&&(e.backup(),e.emit(o.QueryLexer.TERM)),e.ignore(),e.more())return o.QueryLexer.lexText},o.QueryLexer.lexEditDistance=function(e){return e.ignore(),e.acceptDigitRun(),e.emit(o.QueryLexer.EDIT_DISTANCE),o.QueryLexer.lexText},o.QueryLexer.lexBoost=function(e){return e.ignore(),e.acceptDigitRun(),e.emit(o.QueryLexer.BOOST),o.QueryLexer.lexText},o.QueryLexer.lexEOS=function(e){e.width()>0&&e.emit(o.QueryLexer.TERM)},o.QueryLexer.termSeparator=o.tokenizer.separator,o.QueryLexer.lexText=function(e){for(;;){var t=e.next();if(t==o.QueryLexer.EOS)return o.QueryLexer.lexEOS;if(92!=t.charCodeAt(0)){if(":"==t)return o.QueryLexer.lexField;if("~"==t)return e.backup(),e.width()>0&&e.emit(o.QueryLexer.TERM),o.QueryLexer.lexEditDistance;if("^"==t)return e.backup(),e.width()>0&&e.emit(o.QueryLexer.TERM),o.QueryLexer.lexBoost;if(t.match(o.QueryLexer.termSeparator))return o.QueryLexer.lexTerm}else e.escapeCharacter()}},o.QueryParser=function(e,t){this.lexer=new o.QueryLexer(e),this.query=t,this.currentClause={},this.lexemeIdx=0},o.QueryParser.prototype.parse=function(){this.lexer.run(),this.lexemes=this.lexer.lexemes;for(var e=o.QueryParser.parseFieldOrTerm;e;)e=e(this);return this.query},o.QueryParser.prototype.peekLexeme=function(){return this.lexemes[this.lexemeIdx]},o.QueryParser.prototype.consumeLexeme=function(){var e=this.peekLexeme();return this.lexemeIdx+=1,e},o.QueryParser.prototype.nextClause=function(){var e=this.currentClause;this.query.clause(e),this.currentClause={}},o.QueryParser.parseFieldOrTerm=function(e){var t=e.peekLexeme();if(void 0!=t)switch(t.type){case o.QueryLexer.FIELD:return o.QueryParser.parseField;case 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e={ational:"ate",tional:"tion",enci:"ence",anci:"ance",izer:"ize",bli:"ble",alli:"al",entli:"ent",eli:"e",ousli:"ous",ization:"ize",ation:"ate",ator:"ate",alism:"al",iveness:"ive",fulness:"ful",ousness:"ous",aliti:"al",iviti:"ive",biliti:"ble",logi:"log"},t={icate:"ic",ative:"",alize:"al",iciti:"ic",ical:"ic",ful:"",ness:""},n="[aeiouy]",r="[^aeiou][^aeiouy]*",i=new RegExp("^([^aeiou][^aeiouy]*)?[aeiouy][aeiou]*[^aeiou][^aeiouy]*"),o=new RegExp("^([^aeiou][^aeiouy]*)?[aeiouy][aeiou]*[^aeiou][^aeiouy]*[aeiouy][aeiou]*[^aeiou][^aeiouy]*"),a=new RegExp("^([^aeiou][^aeiouy]*)?[aeiouy][aeiou]*[^aeiou][^aeiouy]*([aeiouy][aeiou]*)?$"),s=new RegExp("^([^aeiou][^aeiouy]*)?[aeiouy]"),c=/^(.+?)(ss|i)es$/,u=/^(.+?)([^s])s$/,l=/^(.+?)eed$/,d=/^(.+?)(ed|ing)$/,f=/.$/,h=/(at|bl|iz)$/,p=new RegExp("([^aeiouylsz])\\1$"),m=new 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e}},o.stopWordFilter=o.generateStopWordFilter(["a","able","about","across","after","all","almost","also","am","among","an","and","any","are","as","at","be","because","been","but","by","can","cannot","could","dear","did","do","does","either","else","ever","every","for","from","get","got","had","has","have","he","her","hers","him","his","how","however","i","if","in","into","is","it","its","just","least","let","like","likely","may","me","might","most","must","my","neither","no","nor","not","of","off","often","on","only","or","other","our","own","rather","said","say","says","she","should","since","so","some","than","that","the","their","them","then","there","these","they","this","tis","to","too","twas","us","wants","was","we","were","what","when","where","which","while","who","whom","why","will","with","would","yet","you","your"]),o.Pipeline.registerFunction(o.stopWordFilter,"stopWordFilter"),o.trimmer=function(e){return e.update(function(e){return 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o.TokenSet,i.node.edges[s]=c),i.str.length<=2?c.final=!0:r.push({node:c,editsRemaining:i.editsRemaining-1,str:i.str.slice(2)})}if(i.editsRemaining>0&&1==i.str.length&&(i.node.final=!0),i.editsRemaining>0&&i.str.length>=1){if("*"in i.node.edges)var u=i.node.edges["*"];else{var u=new o.TokenSet;i.node.edges["*"]=u}1==i.str.length?u.final=!0:r.push({node:u,editsRemaining:i.editsRemaining-1,str:i.str.slice(1)})}if(i.editsRemaining>0){if("*"in i.node.edges)var l=i.node.edges["*"];else{var l=new o.TokenSet;i.node.edges["*"]=l}0==i.str.length?l.final=!0:r.push({node:l,editsRemaining:i.editsRemaining-1,str:i.str})}if(i.editsRemaining>0&&i.str.length>1){var d,f=i.str.charAt(0),h=i.str.charAt(1);h in i.node.edges?d=i.node.edges[h]:(d=new o.TokenSet,i.node.edges[h]=d),1==i.str.length?d.final=!0:r.push({node:d,editsRemaining:i.editsRemaining-1,str:f+i.str.slice(2)})}}return n},o.TokenSet.fromString=function(e){for(var t=new o.TokenSet,n=t,r=!1,i=0,a=e.length;i<a;i++){var 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n.output.edges?(v=n.output.edges[f],v.final=v.final||m):(v=new o.TokenSet,v.final=m,n.output.edges[f]=v),r.push({qNode:p,output:v,node:h})}}}return t},o.TokenSet.Builder=function(){this.previousWord="",this.root=new o.TokenSet,this.uncheckedNodes=[],this.minimizedNodes={}},o.TokenSet.Builder.prototype.insert=function(e){var t,n=0;if(e<this.previousWord)throw new Error("Out of order word insertion");for(var r=0;r<e.length&&r<this.previousWord.length&&e[r]==this.previousWord[r];r++)n++;this.minimize(n),t=0==this.uncheckedNodes.length?this.root:this.uncheckedNodes[this.uncheckedNodes.length-1].child;for(var r=n;r<e.length;r++){var i=new o.TokenSet,a=e[r];t.edges[a]=i,this.uncheckedNodes.push({parent:t,char:a,child:i}),t=i}t.final=!0,this.previousWord=e},o.TokenSet.Builder.prototype.finish=function(){this.minimize(0)},o.TokenSet.Builder.prototype.minimize=function(e){for(var t=this.uncheckedNodes.length-1;t>=e;t--){var n=this.uncheckedNodes[t],r=n.child.toString();r in this.minimizedNodes?n.parent.edges[n.char]=this.minimizedNodes[r]:(n.child._str=r,this.minimizedNodes[r]=n.child),this.uncheckedNodes.pop()}},o.Index=function(e){this.invertedIndex=e.invertedIndex,this.fieldVectors=e.fieldVectors,this.tokenSet=e.tokenSet,this.fields=e.fields,this.pipeline=e.pipeline},o.Index.prototype.search=function(e){return this.query(function(t){new o.QueryParser(e,t).parse()})},o.Index.prototype.query=function(e){var t=new o.Query(this.fields),n=Object.create(null),r=Object.create(null),i=Object.create(null);e.call(t,t);for(var a=0;a<t.clauses.length;a++){var s=t.clauses[a],c=null;c=s.usePipeline?this.pipeline.runString(s.term):[s.term];for(var u=0;u<c.length;u++){var l=c[u];s.term=l;for(var d=o.TokenSet.fromClause(s),f=this.tokenSet.intersect(d).toArray(),h=0;h<f.length;h++)for(var p=f[h],m=this.invertedIndex[p],v=m._index,y=0;y<s.fields.length;y++){var g=s.fields[y],w=m[g],_=Object.keys(w),E=p+"/"+g;if(void 0===r[g]&&(r[g]=new 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o.TokenSet.Builder,c=o.Pipeline.load(e.pipeline);e.version!=o.version&&o.utils.warn("Version mismatch when loading serialised index. Current version of lunr '"+o.version+"' does not match serialized index '"+e.version+"'");for(var u=0;u<r.length;u++){var l=r[u],d=l[0],f=l[1];n[d]=new o.Vector(f)}for(var u=0;u<a.length;u++){var l=a[u],h=l[0],p=l[1];s.insert(h),i[h]=p}return s.finish(),t.fields=e.fields,t.fieldVectors=n,t.invertedIndex=i,t.tokenSet=s.root,t.pipeline=c,new o.Index(t)},o.Builder=function(){this._ref="id",this._fields=[],this.invertedIndex=Object.create(null),this.fieldTermFrequencies={},this.fieldLengths={},this.tokenizer=o.tokenizer,this.pipeline=new o.Pipeline,this.searchPipeline=new o.Pipeline,this.documentCount=0,this._b=.75,this._k1=1.2,this.termIndex=0,this.metadataWhitelist=[]},o.Builder.prototype.ref=function(e){this._ref=e},o.Builder.prototype.field=function(e){this._fields.push(e)},o.Builder.prototype.b=function(e){this._b=e<0?0:e>1?1:e},o.Builder.prototype.k1=function(e){this._k1=e},o.Builder.prototype.add=function(e){var t=e[this._ref];this.documentCount+=1;for(var n=0;n<this._fields.length;n++){var r=this._fields[n],i=e[r],a=this.tokenizer(i),s=this.pipeline.run(a),c=new o.FieldRef(t,r),u=Object.create(null);this.fieldTermFrequencies[c]=u,this.fieldLengths[c]=0,this.fieldLengths[c]+=s.length;for(var l=0;l<s.length;l++){var d=s[l];if(void 0==u[d]&&(u[d]=0),u[d]+=1,void 0==this.invertedIndex[d]){var f=Object.create(null);f._index=this.termIndex,this.termIndex+=1;for(var h=0;h<this._fields.length;h++)f[this._fields[h]]=Object.create(null);this.invertedIndex[d]=f}void 0==this.invertedIndex[d][r][t]&&(this.invertedIndex[d][r][t]=Object.create(null));for(var p=0;p<this.metadataWhitelist.length;p++){var m=this.metadataWhitelist[p],v=d.metadata[m];void 0==this.invertedIndex[d][r][t][m]&&(this.invertedIndex[d][r][t][m]=[]),this.invertedIndex[d][r][t][m].push(v)}}}},o.Builder.prototype.calculateAverageFieldLengths=function(){for(var e=Object.keys(this.fieldLengths),t=e.length,n={},r={},i=0;i<t;i++){var 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diff --git a/material/assets/stylesheets/application.cab7c440.css b/material/assets/stylesheets/application.4b085d0e.css
similarity index 95%
rename from material/assets/stylesheets/application.cab7c440.css
rename to material/assets/stylesheets/application.4b085d0e.css
index d6d6069a3..8a8927619 100644
--- a/material/assets/stylesheets/application.cab7c440.css
+++ b/material/assets/stylesheets/application.4b085d0e.css
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.md-search__overlay{-webkit-transform:scale(45);transform:scale(45)}}@media only screen and (min-width:30em) and (max-width:44.9375em){[data-md-toggle=search]:checked~.md-header .md-search__overlay{-webkit-transform:scale(60);transform:scale(60)}}@media only screen and (min-width:45em) and (max-width:59.9375em){[data-md-toggle=search]:checked~.md-header .md-search__overlay{-webkit-transform:scale(75);transform:scale(75)}}@media only screen and (min-width:60em) and (max-width:76.1875em){.md-search__scrollwrap,[data-md-toggle=search]:checked~.md-header .md-search__inner{width:46.8rem}.md-search-result__teaser{max-height:5rem;-webkit-line-clamp:3}}
+/*# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6IiIsImZpbGUiOiJhc3NldHMvc3R5bGVzaGVldHMvYXBwbGljYXRpb24uNGIwODVkMGUuY3NzIiwic291cmNlUm9vdCI6IiJ9*/
\ No newline at end of file
diff --git a/material/base.html b/material/base.html
index 9dfe4c7fc..826058b00 100644
--- a/material/base.html
+++ b/material/base.html
@@ -46,7 +46,7 @@
       {% endif %}
     {% endblock %}
     {% block styles %}
-      <link rel="stylesheet" href="{{ base_url }}/assets/stylesheets/application.cab7c440.css">
+      <link rel="stylesheet" href="{{ base_url }}/assets/stylesheets/application.4b085d0e.css">
       {% if palette.primary or palette.accent %}
         <link rel="stylesheet" href="{{ base_url }}/assets/stylesheets/application-palette.792431c1.css">
       {% endif %}
@@ -167,7 +167,7 @@
       {% endblock %}
     </div>
     {% block scripts %}
-      <script src="{{ base_url }}/assets/javascripts/application.a2b571e1.js"></script>
+      <script src="{{ base_url }}/assets/javascripts/application.24b6416b.js"></script>
       {% if lang.t("search.language") != "en" %}
         {% set languages = lang.t("search.language").split(",") %}
         {% if languages | length and languages[0] != "" %}
diff --git a/material/partials/nav-item.html b/material/partials/nav-item.html
index c3e0b51ba..9a92e80a5 100644
--- a/material/partials/nav-item.html
+++ b/material/partials/nav-item.html
@@ -9,11 +9,11 @@
     {% else %}
       <input class="md-toggle md-nav__toggle" data-md-toggle="{{ path }}" type="checkbox" id="{{ path }}">
     {% endif %}
-    <label class="md-nav__link" for="{{ path }}">
+    <label class="md-nav__link" for="{{ path }}" tabindex="0">
       {{ nav_item.title }}
     </label>
     <nav class="md-nav" data-md-component="collapsible" data-md-level="{{ level }}">
-      <label class="md-nav__title" for="{{ path }}">
+      <label class="md-nav__title" for="{{ path }}" tabindex="0">
         {{ nav_item.title }}
       </label>
       <ul class="md-nav__list" data-md-scrollfix>
@@ -34,7 +34,7 @@
       {% set toc_ = (toc_ | first).children %}
     {% endif %}
     {% if toc_ | first is defined %}
-      <label class="md-nav__link md-nav__link--active" for="toc">
+      <label class="md-nav__link md-nav__link--active" for="toc" tabindex="0">
         {{ nav_item.title }}
       </label>
     {% endif %}
diff --git a/material/partials/search.html b/material/partials/search.html
index c08e6ec6a..6ce8c3b51 100644
--- a/material/partials/search.html
+++ b/material/partials/search.html
@@ -3,7 +3,7 @@
   <label class="md-search__overlay" for="search"></label>
   <div class="md-search__inner" role="search">
     <form class="md-search__form" name="search">
-      <input type="text" class="md-search__input" name="query" required placeholder="{{ lang.t('search.placeholder') }}" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="query" data-md-state="active">
+      <input type="text" class="md-search__input" name="query" placeholder="{{ lang.t('search.placeholder') }}" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="query" data-md-state="active">
       <label class="md-icon md-search__icon" for="search"></label>
       <button type="reset" class="md-icon md-search__icon" data-md-component="reset" tabindex="-1">
         &#xE5CD;
diff --git a/src/assets/javascripts/components/Material/Nav/Collapse.js b/src/assets/javascripts/components/Material/Nav/Collapse.js
index 4d676a4d3..ca02e1ada 100644
--- a/src/assets/javascripts/components/Material/Nav/Collapse.js
+++ b/src/assets/javascripts/components/Material/Nav/Collapse.js
@@ -44,6 +44,18 @@ export default class Collapse {
     this.el_ = ref
   }
 
+  /**
+   * Initialize overflow and display for accessibility
+   */
+  setup() {
+    const current = this.el_.getBoundingClientRect().height
+
+    /* Hidden links should not be focusable, so hide them when the navigation
+       is collapsed and set overflow so the outline is not cut off */
+    this.el_.style.display  = current ? "block"   : "none"
+    this.el_.style.overflow = current ? "visible" : "hidden"
+  }
+
   /**
    * Animate expand and collapse smoothly
    *
@@ -54,6 +66,10 @@ export default class Collapse {
   update() {
     const current = this.el_.getBoundingClientRect().height
 
+    /* Reset overflow to CSS defaults */
+    this.el_.style.display  = "block"
+    this.el_.style.overflow = ""
+
     /* Expanded, so collapse */
     if (current) {
       this.el_.style.maxHeight = `${current}px`
@@ -89,6 +105,11 @@ export default class Collapse {
       target.removeAttribute("data-md-state")
       target.style.maxHeight = ""
 
+      /* Hidden links should not be focusable, so hide them when the navigation
+         is collapsed and set overflow so the outline is not cut off */
+      target.style.display  = current ? "none"   : "block"
+      target.style.overflow = current ? "hidden" : "visible"
+
       /* Only fire once, so directly remove event listener */
       target.removeEventListener("transitionend", end)
     }
@@ -101,5 +122,7 @@ export default class Collapse {
   reset() {
     this.el_.dataset.mdState = ""
     this.el_.style.maxHeight = ""
+    this.el_.style.display   = ""
+    this.el_.style.overflow  = ""
   }
 }
diff --git a/src/assets/stylesheets/layout/_nav.scss b/src/assets/stylesheets/layout/_nav.scss
index 4dff6ec79..e8162c3c7 100644
--- a/src/assets/stylesheets/layout/_nav.scss
+++ b/src/assets/stylesheets/layout/_nav.scss
@@ -395,12 +395,22 @@
     .md-nav__toggle ~ & {
       max-height: 0;
       overflow: hidden;
+
+      // Just hide links for accessibility if JavaScript is not available
+      .no-js & {
+        display: none;
+      }
     }
 
     // Expand nested navigation, if toggle is checked
     .md-nav__toggle:checked ~ &,
     &[data-md-state="expand"] {
       max-height: 100%;
+
+      // Just show for accessibility links if JavaScript is not available
+      .no-js & {
+        display: block;
+      }
     }
 
     // Hide titles for nested navigation
diff --git a/src/assets/stylesheets/layout/_tabs.scss b/src/assets/stylesheets/layout/_tabs.scss
index 64d70c9ef..a3e4b802f 100644
--- a/src/assets/stylesheets/layout/_tabs.scss
+++ b/src/assets/stylesheets/layout/_tabs.scss
@@ -154,6 +154,7 @@
       // Always expand nested navigation on 2nd level
       .md-nav[data-md-level="1"] {
         max-height: initial;
+        overflow: visible;
 
         // Remove left spacing on 2nd level items
         > .md-nav__list > .md-nav__item {
diff --git a/src/partials/nav-item.html b/src/partials/nav-item.html
index 07f6eee0c..74a60e042 100644
--- a/src/partials/nav-item.html
+++ b/src/partials/nav-item.html
@@ -40,12 +40,12 @@
     {% endif %}
 
     <!-- Expand active pages -->
-    <label class="md-nav__link" for="{{ path }}">
+    <label class="md-nav__link" for="{{ path }}" tabindex="0">
       {{ nav_item.title }}
     </label>
     <nav class="md-nav" data-md-component="collapsible"
         data-md-level="{{ level }}">
-      <label class="md-nav__title" for="{{ path }}">
+      <label class="md-nav__title" for="{{ path }}" tabindex="0">
         {{ nav_item.title }}
       </label>
       <ul class="md-nav__list" data-md-scrollfix>
@@ -77,7 +77,7 @@
 
     <!-- Render table of contents, if not empty -->
     {% if toc_ | first is defined %}
-      <label class="md-nav__link md-nav__link--active" for="toc">
+      <label class="md-nav__link md-nav__link--active" for="toc" tabindex="0">
         {{ nav_item.title }}
       </label>
     {% endif %}
diff --git a/src/partials/search.html b/src/partials/search.html
index ca46c7d60..5dfbfda6d 100644
--- a/src/partials/search.html
+++ b/src/partials/search.html
@@ -28,7 +28,7 @@
   <div class="md-search__inner" role="search">
     <form class="md-search__form" name="search">
       <input type="text" class="md-search__input" name="query"
-          required placeholder="{{ lang.t('search.placeholder') }}"
+          placeholder="{{ lang.t('search.placeholder') }}"
           autocapitalize="off" autocorrect="off" autocomplete="off"
           spellcheck="false" data-md-component="query"
           data-md-state="active" />