Initial implementation of the event-based notification system's infrastructure.
Merge branch 'master' into issue230
Implementing a user interface in admin to subscribe/unsubscribe to notifications
Adding missing processing for other events
Merge branch 'master' into issue230

Conflicts:
	app/controllers/DocumentApiController.php
add some basic styling
change OpenGovEvent to MadisonEvent
finish new user signup notification
finish doc_edited notification.  working on doc_commented
finish comment notifications
finish group request verifications
Merge branch 'master' into issue230
add creatAdmin to functional helper
resolve composer conflicts
resolve composer conflicts
add doc_annotated subscription event
add annotation notification
add new document notification
remove reference to annotator-full.min.map
finish admin notifications