title: Add default value to enum type field in schema builder
body: <p>I'm using the following method to create a database column of type <code>ENUM</code> in schema builder:</p>
  
  <pre><code>$table-&gt;enum('status', array('new', 'active', 'disabled'));
  </code></pre>
  
  <p>I'd like to set it's default value to <code>active</code>.<br>
  I tried to do this:</p>
  
  <pre><code>$table-&gt;enum('status', array('new', 'active', 'disabled'))-&gt;default('active');
  </code></pre>
  
  <p>But as you can guess it doesn't set it's default value. I'm using a MySQL database if that's important.</p>