Remove version number from setup.py
Remove version number from setup.py

This only needs to confusion when installing. When we issue releases, let's
modify this file in a separate branch.

18F/regulations-site,tadhg-ohiggins/regulations-site,eregs/regulations-site,eregs/regulations-site,eregs/regulations-site,tadhg-ohiggins/regulations-site,tadhg-ohiggins/regulations-site,eregs/regulations-site,18F/regulations-site,tadhg-ohiggins/regulations-site,18F/regulations-site,18F/regulations-site