Patch to JSONObject to prevent null objects inserted into empty arrays
Encoding support in JSONObjectExt for List<string>
Properties OKLeaderboardID and OKScoreID are now without prefixes:

If the prefix is in the class, e.g. OKScore or OKLeaderboard,
then properties do not need the same prefix.  It is assumed identifiers
belong to OK, unless otherwise stated, as in OKUser.GameCenterID
Using enum for score request type (social/global)
Getting social scores with associated ghost data!