MochiKit documentation overhaul

In preparation for MochiKit's 1.1 release, I've thrown together a pair of custom docutils roles for the MochiKit documentation so that I can throw named anchors on each function.

For example:

http://mochikit.com/doc/html/MochiKit/Async.html#fn-deferred

Now the documentation is cross-referenced rather nicely and it should be relatively easy to scrape out some metadata, perhaps for use by the interpreter, making a function index, search, etc.