title: Pycharm: "scanning files to index" is taking forever
body: <p>I am using PyCharm Community Edition 5.0.1
  It was working fine till yesterday. But it has been stuck at 'Scanning files to index' for a very long time now. Since yesterday.</p>
  <p>I have tried re-installing it, and also tried invalidating cache.</p>
  <p>I can make changes to programs and use it as a text editor but unable to run any file.</p>