Gravity: Add grouping support to database DML query builders.

This starts off with support for grouping conditional statements
(on, where, having), but can be extended in the future to also support
for example unions.
Spark: Add Facebook user profile class.
Spark: Add method to get facebook app access token.
vortex: GCM response wrapper
Corona: Add http return code constants.
Halo: Add functionality to mock and unmock functions.
Corona: Use new function mock methods for RequestRunkitTest.
Vortex: GCM dispatcher implementation.
vortex: removes the set registration ids from payload