Change route logic to redirect to module-specific URL

We now redirect to module specific route (either setup or auth) depending on whether a user account exists or not.  After redirect, a module should take over and handle this request.  This also requires adding new module-specific routes (see password route in server-config.js).

@krulwich, @suprbh, @ceg1236 
This is the code I wrote yesterday I think, but its not going to work if setupRender is asynch. I was thinking the password route might need to be something like:
```
var passwordController = require('./modules/password/auth.js');
app.get('/password/:action', util.checkUser, passwordController[action][method]);
```
Because setupRender isn't going to return any html synchronously as-is.