rename gwt frontend endpoint

[stevenolen]

We've had a few external folks setting up ohmage servers who have used this package, but are very confused about the web frontend's endpoint. since it's hosted at /ohmage by default on your installs, it appears that all of the ohmage code is housed there, instead of it just being the frontend code.

I understand that you were quite against using /web for the frontend, since it was generic, (although, /app is generic) but can we modify the web front-end endpoint to at least make troubleshooting a bit easier? something like /gwt if you don't want to use /web (we use /web internally, which I think would be great).

thanks!