Implemented Consumer Status Report (READ DETAILS)

This PR includes the implementation of the Consumer Status Report.

**NOTE:**
There is a bug in the current query that will be fixed in a seperate PR.
 - If we have a consumer that is active outside of the specified timespan (has not reported a status in a while but has not been deleted), it will not be in the results.

**I'd like to get this merged in despite of the bug above.**
Hmm, we can probably hack around this issue by casting event.getNewEntity() into a BasicDBObject (It already is one, we specify that in the EventCallback), so the cast should be safe.