Bug 962612 - View date grouped history results. r=kgrandon

So unfortunately upgrading a previous device with places seems to break, and I get no history results. It does seem to work fine after a reset-gaia though. I haven't figured out the root cause yet, but if you want to debug that's fine. 

Alternatively I don't think it's the end of the world to lose places, as I think it would only impact dogfooders. If you want to leave this at 1 and rename the DB_NAME, I would support that as well.  Simply ``places``, ``places_db```, etc would be fine.