:bangbang: Support iOS7, won't support versions below iOS6. :trollface:

Just want to pay attention on the logic, not on UI conflicts fixing.
Modify Config file; Fix some errors.

1. Add kTestFlightToke to Config and hide it in AppDelegate file;
2. Fix errors when KY_SESSION_MODE_ON is ON.
Fix error when KY_INVITATION_ONLY is ON
Update submodule: KYUnlockCodeManager
Update project to recommended settings on Xcode5