Stop using rems by default

Conflicts:
	dist/vellum/_forms.scss
	dist/vellum/_variables.scss
More overt color variable naming
Revert "More overt color variable naming"

This reverts commit 57535c30606c8fb335351970a23b39bb72da90e0.
Merge pull request #14 from mobify/remove-rem

Stop using rems by default.
Merge branch origin/master into branch remove-base.