PBJViewController: minor import cleanup
PBJVision: update clean aperture delegate callback method name
PBJVision, minor header clean up
PBJVision, monitor flash and torch availability changes
Sample Project, add a focus view as an example
Sampel Project, fix a bug where the gesture view isn't foremost
PBJVision isActive ---> isCaptureSessionActive
add a method to check if the current device supports flash, fixes GH-50