Replaces toCSS/CSSRenderer's granularity option with FPS option.

Squashed commit of the following:

commit 5c7e2c8927dfde1aa31992f5c2a54e3a87802ec1
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Fri Jul 26 21:13:32 2013 -0700

    Updates docs and index.html.  Removes custom class decoration in toCSS.

commit 994397f3112f141453251b650870c941f680f02d
Author: Jeremy Kahn <jeremyckahn@gmail.com>
Date:   Thu Jul 25 22:18:37 2013 -0700

    Makes initial code changes for conversion to FPS.