title: new Backbone.Model() vs Backbone.Model.extend()
body: <p>I'm new to JS and Backbone</p>
  
  <p>What's the difference between these two?</p>
  
  <pre><code>TestModel = new Backbone.Model({ title: "test title" })
  TestModel = Backbone.Model.extend({ title: "test title" })
  </code></pre>