Update SASS scheme, removing duplicate variables (admin bar and admin menu will always use the same colors, for example; 
we can add more vars if we need them). Adds a Gruntfile & package.json for easier compiling (see http://gruntjs.com/getting-started). 
Add the remaining color schemes from melchoyce.




git-svn-id: https://plugins.svn.wordpress.org/mp6/trunk@763258 b8457f37-d9ea-0310-8a92-e5e31aec5664