Switch from six to using 2to3.

[seanfisk]

With some upcoming changes in the Python Project Template (on which this project is based), I would like to get rid of Paver and go back to plain Setuptools. This should allow us easier access to features such as automatic runs of 2to3 fixers, eliminating the need for six.

[tivek]

Just a thought, would it be possible to use 3to2 instead of 2to3? This would allow the default code to be written in Python 3 syntax. At this point I am asking only out of personal curiosity and preference. However, as more people and projects migrate to Python 3 (and as Py3 keeps getting the language improvements), it will make sense to allow choosing the default syntax.

[CreamyCookie]

Yeah, I agree. Python 3 is much better (and cleaner).