Add docstrings to some of the WSME types

Change-Id: I22b5ac9d8a103507a9dd864bf9d667a4709890d1
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
More doc work for v2 API

Hand-code some of the documentation to serve as an example.
First pass at a sphinx plugin to auto-generate the same
docs, although this implementation will be discarded
completely next week.

Change-Id: I51314510f72969d714fa3fa44f1fd388533f36e8
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>