Calibration layout v1
WIP Calibration screen. Progress bar added. Refactored detail fragment dispatch.
Semi-stable calibration screen listens for events, does nothing yet.
added (untested) target hit logic, game logic, scores tracking
Add functioning Calibration Screen. Reduce minSdk to 16.
New and improved GameplayView
Merge branch 'calibration' into TargetLogic

Conflicts:
	src/com/example/ReverseShootingGallery/GameplayView.java
Resolve:
	Trivial.
Rig up tilt neutral usage in GameplayView.