Added scale animation.
Merge branch 'scale-animation' of github.com:zakerlabs/JazzHands into zakerlabs-scale-animation

Conflicts:
	src/IFTTTAnimationFrame.h
	src/IFTTTAnimationKeyFrame.h
	src/IFTTTAnimationKeyFrame.m
	src/IFTTTJazzHands.h
minor cleanup & readme update