title: Angular Timer not working
body: <p>I want to display a count down timer.I have been referring the following page
  <a href="http://siddii.github.io/angular-timer/" rel="nofollow">http://siddii.github.io/angular-timer/</a></p>
  
  <p>But i am getting the below error.</p>
  
  <blockquote>
    <p>Error: Invalid isolate scope definition for directive timer: @?</p>
  </blockquote>
  
  <p>Could anybody tell me what i am i missing out.</p>
  
  <p>index.html</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html ng-app="app"&gt;
  &lt;head&gt;
  &lt;meta charset="ISO-8859-1"&gt;
  &lt;title&gt;Insert title here&lt;/title&gt;
  &lt;script type="text/javascript" src="angular.min.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="angular-timer.min.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="app.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;timer end-time="1451628000000"&gt;{{days}} days, {{hours}} hours, {{minutes}} minutes, {{seconds}} seconds.&lt;/timer&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>app.js</p>
  
  <pre><code>var appModule=angular.module('app', ['timer']);
  </code></pre>