SHGameCenter updated to 0.1.0 (from 0.0.1). No longer patched, but smaller features. Getting closer to stabilizing the API. Will start adding to the CHANGELOG when we hit 1.0.
Breaking API changes from 0.0.1

SHGameCenter class no longer holds anything in its public interface.
Authentication is on GKLocalPlayer
MatchesAndFriends is on GKTurnBasedMatch
Match update blocks is on GKTurnBasedMatch