If we're eventually going to integrate the PEP-257 tool into Review Bot (which

I think we should), we should get our docstring house in order first. This

change goes through reviewboard/accounts and fixes most of the issues that

aren't just a missing docstring.
The one "error" that I chose to disable for this is D203, which wants a blank

line before class docstrings. I didn't see any justification for this in the

actual PEP-257 document, and I think it's ugly. There are also a couple cases

that I chose to ignore where our test docstrings which wrap didn't follow the

usual rules. There are a ton of things that have missing docstrings, but those

will require more work to clean up.

Ran unit tests
Ran pep257 --ignore=D203 reviewboard/accounts