Fix #538, pull out color/style helpers in the process - is this good?

So this is another case of small change turning into more refactoring - to get rid off the error I needed to have normalize_style available for the `style` method. 

So I created a helper methods on the modules/classes... but maybe they should be an own module providing instance methods.

Feedback? Suggestion?

I'm probably gonna/want to move the Color Helpers in their own file either way.

Greetings from FOSDEM! =)
Tobi