Replaced all references to the radius mixin with border-radius.
Updated the side-radius mixin to remove vendor prefixes.
Removed all uses of vendor prefixed box-shadow property.
Removed all references to vendor prefixed transition property.
Added grunt-autoprefixer. This is just an initial commit as a proof of concept. Further tweaking of the Gruntfile options will be needed, and all other vendor prefixed properties will need to be removed.