title: Installing 'Compass' via the command line receive error "extconf failed, exit code 1"
body: <p>Couldn't find an answer to this. 
  Running OS X Yosemite Beta v2 </p>
  
  <p>When following compass install guide ensure that your gem is up-to-date</p>
  
  <pre><code>gem update --system
  </code></pre>
  
  <p>Then run</p>
  
  <pre><code>gem install compass 
  </code></pre>