Added x-in-square exercise.
Backbone: loading a template.
Updated backbonetutorials README.
Backbone: Listening for events.
Backbone: fun with models.
Added more resources to the backbonetutorials README.
Skeleton Sinatra app for backbone tutorials.
Sinatra app now serves the backbone tutorial index page.
Reconfigured backbone/sinatra as a classic-style sinatra app.
Backbone tutorials connected with RethinkDB via Sinatra.