Readme: Fix Bundler Exec link
Merge pull request #41 from nschonni/patch-1

Readme: Fix Bundler Exec link
Adopted grunt-contrib-sass option docs style
Merge pull request #37 from passy/option-docs

Adopted grunt-contrib-sass option docs style
Revise docs and messages, clarify that Compass runs on top of Sass
Add brief description of Compass