[#139] Removed obsolete /api URL pattern using django-piston.
[#139, #263] Changed / redirections to /home when on rsr.akvo.org.
The web server routing config in turn redirects this to the akvo.org server.
[#139] Removed the FORCE_SCRIPT_NAME setting.
We won't need this when RSR is on the rsr.akvo.org subdomain.