Added emailClicks feature flag

closes https://github.com/TryGhost/Team/issues/1883

ghost/admin/app/services/feature.js

@@ -65,6 +65,7 @@ export default class FeatureService extends Service {
     @feature('memberAttribution') memberAttribution;
     @feature('searchHelper') searchHelper;
     @feature('emailAlerts') emailAlerts;
+    @feature('emailClicks') emailClicks;
 
     _user = null;
 

ghost/admin/app/templates/settings/labs.hbs

@@ -252,8 +252,21 @@
                         </div>
                     </div>
                 </div>
+                <div class="gh-expandable-block">
+                    <div class="gh-expandable-header">
+                        <div>
+                            <h4 class="gh-expandable-title">Email clicks</h4>
+                            <p class="gh-expandable-description">
+                               Enable email clicks tracking.
+                            </p>
+                        </div>
+                        <div class="for-switch">
+                           <GhFeatureFlag @flag="emailClicks" />
+                        </div>
+                    </div>
+                </div>
             </div>
         </div>
         {{/if}}
     </section>
-</section>
+</section>

ghost/core/core/shared/labs.js

@@ -32,7 +32,8 @@ const BETA_FEATURES = [
 
 const ALPHA_FEATURES = [
     'urlCache',
-    'beforeAfterCard'
+    'beforeAfterCard',
+    'emailClicks'
 ];
 
 module.exports.GA_KEYS = [...GA_FEATURES];