adding WCM Notification Inbox web console plugin to show the current con...

...figurations and inbox sizes

Sometimes the WCM notification inboxes can get out of control. This web console plugin provides some administrative ability to clean them out. Not the most exciting UI, but it works...

![adobe_experience_manager_web_console_-_wcm_inbox](https://cloud.githubusercontent.com/assets/65906/3969749/c3511e1a-27c3-11e4-8bd9-3fb002cc3f4e.png)