converted project to sass
Using Sass' "force preserve comments" feature to go back to using style.css as the compiled CSS file name;
Changed the "base" directory to "underscores" to make it clearer that those styles came from the main _s project;
Updated the component underscores pieces to match the latest code from Automattic
Modified the README for instructions particular to this fork.
minor wording change
Fixed a Markdown bug and added links to the Sass and Compass projects.
Fixed typo in comment.
Merge branch 'automattic' of github.com:taupecat/_s into automattic

Conflicts:
	style.css