Add new facility mode for reporting rate report

![screenshot 2014-12-04 12 33 01](https://cloud.githubusercontent.com/assets/152134/5303289/1f1d18ca-7bb6-11e4-872d-c100bd3871c4.png)

https://docs.google.com/a/dimagi.com/document/d/1WkTqsdy4aC-gF1j0mGUCs7p_Y41jK5LGq0kxDJWF_hQ/edit
The logic was changed a little bit too. For the facility type report, we might also need a transaction that is out of that window (but before the end date). Refactoring it to use sofabed sounds good, but I don't really know where to start on that (I've never used that before).