rake api:sync task

the intent of having this rake task is to make sure that all
organization and event info is synchronized with facebook and other
various resources (events.berkeley.edu and callink.berkeley.edu)

Currently, running rake api:sync will retrieve all callink clubs and events for
clubs that have a facebook page

TODO: save events.berkeley.edu events
Note: facebook group events will only be synced when a user is logged in
and is browsing events