fix rgb/rgba color parsing, added appropriate test cases for it

(cherry-picked from 0.3.x)
added mit license file
version bumped for package with license
removed all properties that weren't CSS2 as listed: http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSS2Properties

I saved a few (like borderRadius and opacity). This will make it easier
for me to get all the parsing, short hand and implicit properties that
are most important done sooner. I bumped the version to 0.3.0 because
this could be a breaking change.