Updated Gerrit documentation and development script

Hi,

I have updated the Gerrit wiki page,

http://avogadro.openmolecules.net/wiki/Working_with_Gerrit

I also updated the setup for development script. I would encourage you
to rerun the script, and when prompted reply n to is the Gerrit
username/URL correct, you can then enter your username and it will add
the updated Gerrit remote URL for you.

If you have any problems updating please let me know.

Thanks,

Marcus

Marcus D. Hanwell, Ph.D.
R&D Engineer, Kitware Inc.
(518) 881-4937