Beginnings of the multi-step RSVP process.

For now, the controllers and the routes are defined in a single file.

There are functionalities for moving between the routes.

We need a way to have a common state so we aren't going back to the server each time. For now this is a global.
Merge branch 'rsvp-client' of github.com:borwahs/natalieandrob.com into rsvp-client