setting up social leaderboards
add class declaration for linker workaround
building blocks of UI for social leaderboards in place + game center score submission
abstracting facebook login, updated gamecenter leaderboard code, creating specialized UI cell classes
get list of facebook friends working
super basic UI for social leaderboards working
fix crash in gamecenter login
added spinner to loading of social scores
get facebook friends scores in leaderboard model
updating unity bridge for gamecenter wrapper
add more header files to include directory
added game center login to unity bridge
Merge branch 'social_leaderboards' into development