Multiple atlas support, animation component was extracted from tk2dSpineSkeleton
Code cleanup, fixed empty skeleton data errors, renderer materials are updated once with submeshes cached
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Color -> Color32 in skeleton mesh generation
Merge remote-tracking branch 'origin/master'

Conflicts:
	spine-tk2d/Code/tk2dSpineSkeleton.cs