title: Passing a function as an attribute value
body: <p>I was wondering if it was possible to pass a function <code>foo()</code> as an attribute <code>func="foo()"</code> and have it called <code>this.func()</code> inside of the polymer element?</p>
  
  <pre><code>&lt;foo-bar func="foo()"&gt;&lt;/foo-bar&gt;
  
  
  Polymer({
    is: 'foo-bar',
    properties: {
      func: Object,
    },
    ready: function() {
      this.func();
    }
  });
  </code></pre>
  
  <p>I've been trying to get this working for ages with no luck.</p>
  
  <p>Thanks in advance.</p>