[Reviewer: Andy] Move from using bootstrap.py to easy_install

Andy, please can you review my fix to move from using bootstrap to using easy_install directly (bootstrap just installed a new easy_install to use under the covers anyway).  easy_install supports gzip encoding, which means the problem with pypi.org serving gzip-encoded content in response to a request for identity-encoded content goes away.  I've tested this on repo.cw-ngv.com.

A similar change to ellis will follow shortly.