[Button] Add Text color to Basic Button :focus

[avalanche1]

.basic.button :focus should have the same styling as .basic.button :hover
otherwise you cannot visually distinguish where your focus is at when tabbing through them
http://jsfiddle.net/efp8z6Ln/150/ (try tabbing through all btns)

[ikourfaln]

+1

[jlukic]

This added a few kb to rules but is probably worth it in the long run. I've moved all docs examples to be keyboard focusable to help demonstrate.

[avalanche1]

Wow, that was a lot of work! But definitely worth it! You're my hero!

[avalanche1]

box-shadow is, but color is still not changed on :focus.

[jlukic]

I can confirm text color is missing from :focus