Prevent AJAX requests to anchor links

Turbolinks 5 doesn't follow the browser's standard behaviour of ignoring
links pointing to "#", so we're preventing the turbolinks events in this
situation:

app/assets/javascripts/application.js

@@ -42,6 +42,7 @@
 //= require jquery-fileupload/basic
 //= require foundation
 //= require turbolinks
+//= require turbolinks_anchors
 //= require ckeditor/loader
 //= require_directory ./ckeditor
 //= require social-share-button

app/assets/javascripts/turbolinks_anchors.js

@@ -0,0 +1,15 @@
+(function() {
+  "use strict";
+
+  // Code by Dom Christie:
+  // https://github.com/turbolinks/turbolinks/issues/75#issuecomment-443256173
+  document.addEventListener("turbolinks:click", function(event) {
+    if (event.target.getAttribute("href").charAt(0) === "#") {
+      Turbolinks.controller.pushHistoryWithLocationAndRestorationIdentifier(
+        event.data.url,
+        Turbolinks.uuid()
+      );
+      event.preventDefault();
+    }
+  });
+}).call(this);