Elgg/Elgg — pull request #7104 by ewinslow (2014-07-24 07:36:20+00:00)
Title: chore(php): convert class underscores to namespaces

I believe the only public underscore classes were:
* Elgg_Notifications_Notification
* Elgg_Notifications_Event

I added those as extensions of their namespaced counterparts for backwards compatibility.