Update requirements file
Update requirements file

Update the requirements file for pip

distribute should no longer be required because the virtualenv
should be created with "virtualenv --distribute"

pytz has unconventional versions which causes propblems for pip.
The workaround is to explicitly specify a minimum version.

denverfoundation/storybase,denverfoundation/storybase,denverfoundation/storybase,denverfoundation/storybase