Get rid of setuptools

[mturk]

We don't need setuptools anymore. The entry_points can be accomplished much more easily than with setuptools, since we're moving to a cmdln.py approach. Additionally, the egg installation adds a bunch of files and so on that we don't need.

So this will include two steps:

1. Removing ez_setup.py from the repo, removing all setuptools-based extensions
2. Changing the installation script to NOT use easy_install for the various components there. (This should improve things, actually.)

Should we use pip? It has gotten some good buzz lately.

[mturk]

Have had preliminary success with Distribute. It's ... nice.

[mturk]

Moved in r1614 to using pip and distribute.