Add ember-simple-auth, setup login

- Allow dropdown-buttons to render a partial

ember/app/authorizers/flarum.js

@@ -0,0 +1,11 @@
+import Base from 'simple-auth/authorizers/base';
+
+export default Base.extend({
+	
+	authorize: function(jqXHR, requestOptions) {
+	    var token = this.get('session.token');
+	    if (this.get('session.isAuthenticated') && !Ember.isEmpty(token)) {
+	      jqXHR.setRequestHeader('Authorization', 'Token ' + token);
+	    }
+	  }
+});