Added a note to the TL;DR section

I added a note in the section "Quick Configuration for Lazy Readers" pointing out that when Restangular is added as a dependency in app.js it is not capitalized "restangular" but when it is injected into a function for use it is "Restangular". This was something that I and a Co-worker were a bit tripped up on. (We took the Lazy Reader approach).