remove use of deprecated setup_environ

[ptone]

as of the following changeset slated for Django 1.4:

https://code.djangoproject.com/changeset/16964

setup_environ is deprecated in favor of properly setting up the project on the pythonpath

in my brief testing, I was able to comment out the call to setup_environ, and I'm not sure that it is even doing much for gunicorn currently - as gunicorn already does a fair amount of magic around determining where the project is.

The changes noted above do not require 1.4 code, but is a step in enforcing sane project layout and location.

[benoitc]

fixed in cc43f89 . Thanks!