added rotation transform
added rotation transform
Merge branch 'feature/rotation-animation' into feature/center-animation-transform

Conflicts:
	JazzHandsDemo/JazzHandsDemo.xcodeproj/project.pbxproj
	src/IFTTTAnimationFrame.h
	src/IFTTTAnimationKeyFrame.h
	src/IFTTTAnimationKeyFrame.m
	src/IFTTTJazzHands.h