This is now a release candidate for 1.0.0.
Added tox file.

* Copied from Superzippy's tox file.
* Untested.
Added support for 2.6 testing w/ tox.

* 2.5 is not yet supported, and though I'd like to in the future it
  looks like it will be difficult to support. Currently pip can't
  even run the setup.py file because setuptools 2.x does not support
  Python 2.5.