Add ember-simple-auth, setup login

- Allow dropdown-buttons to render a partial

ember/app/controllers/login.js

@@ -1,11 +1,32 @@
 import Ember from 'ember';
 
-// import NotificationMessage from '../models/notification-message';
+import AuthenticationControllerMixin from 'simple-auth/mixins/authentication-controller-mixin';
 
-// export default Ember.Controller.extend(Ember.SimpleAuth.LoginControllerMixin, Ember.Evented, {
+export default Ember.Controller.extend(AuthenticationControllerMixin, {
 
-// 	authenticatorFactory: 'authenticator:flarum'
+	authenticator: 'authenticator:flarum',
+
+	actions: {
+		authenticate: function() {
+	      var data = this.getProperties('identification', 'password');
+	      var controller = this;
+	      this.set('error', null);
+	      this.set('loading', true);
+	      return this._super(data).then(function() {
+	      	controller.send("sessionChanged");
+	      }).catch(function(errors) {
+	      	switch(errors[0].code) {
+	      		case 'invalidLogin':
+	      			controller.set('error', 'Your login details are incorrect.');
+	      			break;
+
+	      		default:
+	      			controller.set('error', 'Something went wrong. (Error code: '+errors[0].code+')');
+	      	}
+	      }).finally(function() {
+	      	controller.set('loading', false);
+	      });
+	    }
+	 }
 	
-// });
-
-export default Ember.Controller.extend();
+});