Write documentation for the soy.joints module, its types, and their methods/properties.

This will take the form of PyDoc strings embedded in PySoy. You'll need to start by building libsoy and PySoy from Mercurial and then editing or adding PyDoc strings to pysoy/src/joints/*.c.

When you've done, commit your work and post the resulting changeset url to this task.

While working on this task you should join and remain in #PySoy on Freenode to get help, feedback, and guidance from mentors and other developers. Code updates which may affect your work are also announced here as they happen.

The Python bindings for soy.joints must be complete before this task can be assigned.