Add interpolation support for CGColorRef
Change from- and toValue to id
WS
Refactor platform specifics
Relax type compatibility requirements
Add specs for RBBLinearInterpolation
Merge branch 'master' into color-support
*sigh*
Make color interpolation work on 10.8
Set iOS deployment target to 7.0
Merge branch 'master' into color-support

Conflicts:
	.travis.yml
Extract variable in specs
Fix specs on 10.8
Merge pull request #15 from robb/color-support

Add Color support