major: adds facebook checkins as a data source for ranking locations. unfortunately our app does not currently seem to have the right permissions to grab checkins, so they have been temporarily removed from our algorithm minor: experiements with a facebook users groups and likes to see if these can also be used for ranking.
fixes facebook checkin problems and adds code to pull 'interesting events'
Merge branch 'master' of https://github.com/paperbakwriter09/RideMix