setup.py: don't require setuptools for the initial 'safe_develop' command
setup.py: don't require setuptools for the initial 'safe_develop' command

We're building a virtualenv anyways, which includes setuptools (or
rather 'distribute'), so it will be available by the time 'safe_develop'
turns around and calls 'develop'.

This change should make it possible to run 'safe_develop' on a system
without setuptools installed.

warner/petmail,warner/petmail,warner/petmail