iOS 6 & CallBar support (partial)

this should support the two button (non-lockscreen) interface for iOS 6, as well as the button interface for CallBar (however not with the gestures option).
Some of the iOS 7 portion has been changed as well, however it isn't tested, so functionality isn't guaranteed. (although i used a class which seemed to be consistent between iOS 6/7) .

Feel free to review changes, and make adjustments.