title: Get width of table cell in directive when that width is set dynamically in the template
body: <p>OK... I have a template:</p>
  
  <pre><code>&lt;th width="{{setWidth(1)}}%"&gt;{{deal}}&lt;/th&gt;
  </code></pre>
  
  <p>I have a directive: </p>
  
  <pre><code>.directive('tableheaders', function($window,$compile) {
      return function(scope) {
      var th = document.getElementsByTagName('th');
  
      for (var i = 0; i &lt; th.length; i++) {       
          console.log(th[i].width); // returns "{{setWidth(1)}}%" need "100%"
      }
  </code></pre>
  
  <p>How do I compile the value of width being sent so I can use it?</p>