Add initial Backbone guidelines

Conventions in the Backbone.js community:

http://ricostacruz.com/backbone-patterns/#conventions
https://learn.thoughtbot.com/products/1-backbone-js-on-rails
https://learn.thoughtbot.com/workshops/22-hands-on-backbone-js-on-rails

The common alternative naming convention `App.Models.Photo` /
`App.Collections.Photos` / `App.Views.Photo` is unnecessary in Asynchronous
Module Definition-style projects using a library like RequireJS.

http://requirejs.org/docs/whyamd.html
I'm not a big fan of one-liners. I like calling out the drama of a function by indenting it.

The second suggested version also feels a little too clever to me, obscuring the intent.

It feels clearer to me to write out "when the document is ready... function time! time to defer logic until this event happens! lazy evaluation! ... Initialize the Backbone app."