httplib2 0.7.1 is no longer available from PyPi.
This makes executing the README instructions no longer possible.
.1 It can still be downloaded with the explicit path to the google code page:
http://httplib2.googlecode.com/files/httplib2-0.7.1.tar.gz
The only versions on pypi are now 0.7.2-0.7.4.
It looks like .2-4 adds stuff surrounding tests, godaddy certs, appengine and some digest auth methods, so it seems like going up to 0.7.4 won't break anything, but we haven't run the full test suite against it... however, it looks like OAuth, Hg, Pysolr, pip, formencode and others use it, so there might be stuff outside of the test suite that would break if there were some kind of regression/undocumented feature used by any of those modules.
Pushed an updated requirements-common.txt on dev