Added Cloud functionality through MobileBackend

Current functionality:
- On app start, loads all creeps from cloud with user as either creeper or
  victim.
- Adds new creeps to cloud when you make them

To be added:
- Get location updates from people you're creeping (either through
  pub/sub, which would be broadcast and iffy on the security side, or
  through push notification, which would probably be more data intensive).

Problems to be fixed (Cloud):
 - Fix problem with continuous queries - should monitor changes to creeps
   from the cloud, but only does so once (FUTURE scope not activating).
 - Fix problem with Filter.or not working.

Improvements to be made:
- Change the way FriendSelectorActivity autocomplete for contacts works so
  that it will display both name and number in the autocomplete textview
  element.