Keep generic utility classes out of core

This way when people write their own themes - they won't have to
override utility classes - they can use normal CSS selectors.
Revert "Keep generic utility classes out of core"

This reverts commit 3a04e473650385bdeb3d3276ff6db3a4807aa2f5.
Merge pull request #2766 from obrignoni/2.2/strapped

Weee! Thanks man.