Add SASS to /src

[colinStevenson]

Right now, there are mirroring LESS and SASS files in /dist. Any style change requires us to update both LESS and SASS versions. Convention would have us make any code modifications in /src and have the contents of /dist be generated based on those updates. Either the lib should choose btw LESS or SASS or there should be a build step that takes what is in /src and outputs a LESS and SASS version.

[micha3ldavid]

My vote would be to lose the LESS since SCSS is more powerful. However, older/existing Markit sites use the LESS references in the projects so it's best we don't get rid of the LESS all-together.

Searching through NPM I found a bunch of LESS-to-SCSS converters, however, we want the opposite so we're working with the more powerful language. I can't seem to find a SCSS-to-LESS converter and that might be because SCSS is so much more powerful, which is why I had these mirror files to begin with.

Thoughts?