Webmail: new option to create subfolder

UI/WebServerResources/js/Mailer/mailbox-model.js

@@ -235,6 +235,16 @@
     return Mailbox.$$resource.post(this.id, 'batchDelete', {uids: uids});
   };
 
+  /**
+   * @function $newMailbox
+   * @memberof Account.prototype
+   * @desc Create a new mailbox on the server and refresh the list of mailboxes.
+   * @returns a promise of the HTTP operations
+   */
+  Mailbox.prototype.$newMailbox = function(path, name) {
+    return this.$account.$newMailbox(path, name);
+  };
+
   /**
    * @function $omit
    * @memberof Mailbox.prototype