[plugin.is.color] create color expectation helper

[rodneyrehm]

Comparing colors can be quite difficult. The annoying, yet not difficult part is not dealing with different notations rgb(123,123,123) === #7B7B7B. The difficult part is allowing fuzzy comparison: #7B0 === #7B1

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see dalekjs/dalek#126 and dalekjs/dalek#50

[Munter]

I solved this problem in https://github.com/One-com/one-color#comparing-color-objects

It also gives you a nicer highlevel interface where you can eat any color format out of the box without having to manually detect color spaces and deal with conversions. Color spaces are figured out automatically and conversions for comparisons are implicit

[rodneyrehm]

nice! now we need to figure out how to wrap that in an expectation and we have our first plugin package :)