82 -  CSS style guide

A proposed style guide to cover CSS code commits to the jQuery projects.  Open to suggestion for rules, this pass is based on the CSS in jQuery Mobile and jQuery UI.

Based off of Issue https://github.com/jquery/contribute.jquery.org/issues/82
I feel like this is too short to be understood. There are times when not using shorthand is the right thing and this doesn't explain when that is. Anything that's entirely up to the developer to determine isn't really a style rule.