Prerelease Build 7 - Headers, Swatches + buttons

Build 7 Introuduces:
Swatches (taken from flatuicolors.com): Currently only greyscale, these
are the default colors used in Kite

Headers: h1-h6 now have proper sizes with accordance to W3's HTML
standardisation.

Buttons: By far the most time spent on buttons this build, it adds six
kinds of buttons, Standard, Info, Successful, Danger, Warning and
Inversed.