WIP SCSS conversion

I put together some changes to work toward a sass/scss port.
I made a best guess with where to put some stuff, and because of the current directory structure I placed the theme scss in the same folder as the less.  This may need to be looked at.
SCSS requires vars be defined before referenced, so some stuff probably still needs to be shuffled a bit.  One problem I found was that normalize.less references @base-code-font-family while it is defined in the next @import base.less.  This needs to be looked at.

#### TODO:
 - fix mixins/hooks
 - add !default flag to variables
 - add compile task
 - get variables defined before they are referenced (to be discovered after .hook-* refs are fixed)

partially addresses #260 interested in [official] SASS port of uikit