Fixing pip install on Maverick

`setproctitle` https://pypi.python.org/pypi/setproctitle version 1.1.8 fixes build error on OS X Maverick
Updating py-bcrypt

security hole fixed in `py-bcrypt`, updating from 0.2 to 0.4
Merge pull request #55 from bkendall/fix-maverick-build

Fixing pip install on Maverick