Adding a unit conversion function and scaling factor store.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>
Merge pull request #970 from enyojs/ENYO-690-rem-blakestephens

Adding a unit conversion function and scaling factor store.
Merge pull request #969 from enyojs/ENYO-690-rem-aarontam

ENYO-690: Create LESS "plugin" for resolution independence.

Integrated-By: Aaron Tam (aaron.tam@lge.com)
ENYO-690: Convert arguments of CSS functions.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>