Expanding pure with component CSS

Sources:
https://github.com/yui/pure/releases/download/v0.3.0/pure-0.3.0.zip
https://github.com/yui/pure/releases/download/v0.2.1/pure-0.2.1.zip
https://github.com/yui/pure/releases/download/v0.2.0/pure-0.2.0.zip
https://github.com/yui/pure/releases/download/v0.1.0/pure-0.1.0.zip

Files already minimised, no version bump required. Embarrassingly
simple for me, really.
Merge pull request #2464 from petecooper/master

Expanding pure with component CSS