tom class. Every factory is registered with a particular key.
For example, the index template is registered with the key <code>template:index</code>, and
the application route is registered with the key <code>route:application</code>.</p>
<p>Registration keys have two segments split by a colon (<code>:</code>). The first segment is
the framework factory type, and the second is the name of the particular
factory. Hence, the <code>index</code> template has the key <code>template:index</code>. Ember has
severa