remove completion handler (authentication change is detected by notification)
remove obsolete TODOs
implement method in JCSMove for move input of AI player and move replay for multiplayer games
enable NSAssert for Release build configuration
issue #4: basic handling for quitting out of turn (on other player's side)
Revert "issue #4: basic handling for quitting out of turn (on other player's side)"

This reverts commit bf3780eac1dd1680c142e1e43aa55d1fb0812d86.
fix issue #5: disable move input completely if GameCenter match is not in open state
set initial position immediately instead of posting an action to the event loop; this avoids the flickering appearance of the screen at (0,0) on the first frame
hide status bar on iOS 7 beta 2
enable mipmapping for downscaled texture atlas
correctly detect player de-authentication and stay on unaffected screens (fix for issue #7)
set development team in Xcode
set turn based event handler only after successful authentication
allow modification of the start cell by tapping another own cell (enhancement #8)
disable and re-enable GameCenter capability to make Xcode happy
don’t accept move direction if destination cell is unreachable (issue #10)
add FPS images to avoid errors during startup, but disable FPS stats
remove redundant code signing settings