Fixes CSS @keyframe bug introduced by 1.0.2.

Squashed commit of the following:

commit 64e9a9c83d1638b7ebdb49a27b573edef2e922d9
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Feb 1 19:46:27 2014 -0600

    Builds 1.0.3.

commit 729c0907b326235e2b6fcc3b1f63914ee67baf2e
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Feb 1 19:44:40 2014 -0600

    Adds test that was failing before the bug fix.

commit 422628351dfa9c98b03fecedcbbcf82379ce9087
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Sat Feb 1 19:42:07 2014 -0600

    Adds potential bug fix code.