Fix link to documentation

Those releases are what we import, and have final Py3k-compatible releases.

Runns 'setup.py develop' and installs documentation dependencies.

Runns 'setup.py develop' and installs testing dependencies.

The code worked around a bug in the stdlib's 'urlparse.urlsplit' for
Python < 2.7; that workaround broke under 2.7.

Fixes #5

It is being moved to RelStorage.

Also, fix bugs uncovered thereby in processing float / tuple arguments.