title: How and when to use Ember.Application register and inject methods?
body: <p>I'm trying to understand how to use Ember.Application <a href="http://www.ember-doc.com/classes/Ember.Application.html#method_register">register</a> &amp; <a href="http://www.ember-doc.com/classes/Ember.Application.html#method_inject">inject</a> methods</p>
  
  <p><strong>What use case are these functions designed for?
  How are they to be used and when?</strong></p>
  
  <p>I'd really like to know!</p>