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 
It's perfectly OK to do a file read in async to process your GET request.  I guess, what I'm asking is , can't we return a response using a view template inside of your callback function being passed in readFile?  That is, 

`
app.get('/password/:action', function(req, res) {
  if (action === 'setup') { 
    fs.readFile('/path', function(err, file) {
      // generate password-setup view using data read from file
      res.render('password-setup);
  }
});