Upgrade express.js to 4.12

no ref
- Fix deprecation warnings

core/server/data/sitemap/handler.js

@@ -6,7 +6,7 @@ var _       = require('lodash'),
 module.exports = function (blogApp) {
     var resourceTypes = ['posts', 'authors', 'tags', 'pages'],
         verifyResourceType = function (req, res, next) {
-            if (!_.contains(resourceTypes, req.param('resource'))) {
+            if (!_.contains(resourceTypes, req.params.resource)) {
                 return res.sendStatus(404);
             }
 
@@ -25,7 +25,7 @@ module.exports = function (blogApp) {
     });
 
     blogApp.get('/sitemap-:resource.xml', verifyResourceType, function (req, res) {
-        var type = req.param('resource'),
+        var type = req.params.resource,
             page = 1,
             siteMapXml = getResourceSiteMapXml(type, page);
 

package.json

@@ -41,7 +41,7 @@
         "compression": "1.2.2",
         "connect-slashes": "1.3.0",
         "downsize": "0.0.8",
-        "express": "4.10.6",
+        "express": "4.12.0",
         "express-hbs": "0.7.11",
         "extract-zip": "1.0.3",
         "fs-extra": "0.13.0",