title: ember js count number of records in store
body: <p>When I try:</p>
  
  <pre><code>return this.store.findAll('book');
  </code></pre>
  
  <p>The console returns a list of books like:</p>
  
  <pre><code>books/1, books/2, books/3
  </code></pre>
  
  <p>If I install the ember add-on then in DATA I will have 'book(3)'.</p>
  
  <p>Now How can I show this number to the templates?</p>