title: $cordovaFile.checkDir says folder does not exist but $cordovaFile.createDir says folder already exists
body: <p>I am trying to work with the ngCordova File plugin as documented here: <a href="http://ngcordova.com/docs/plugins/file/" rel="nofollow">http://ngcordova.com/docs/plugins/file/</a>, but am getting strange behaviour.</p>
  
  <p>I am trying to create a folder if it does not already exist. I am testing for its existence using:</p>
  
  <p><code>$cordovaFile.checkDir(cordova.file.dataDirectory, 'inbound')</code></p>
  
  <p>Now this returns <code>NOT_FOUND_ERR</code> so i try to create the folder subsequently by calling:</p>
  
  <p><code>$cordovaFile.createDir(cordova.file.dataDirectory, 'inbound', false);</code></p>
  
  <p>But this then returns <code>PATH_EXISTS_ERR</code></p>
  
  <p>Why would checkDir tell me it does not exist, but then createDir tell me it DOES exist?</p>
  
  <p>NOTE: This is using an Android device.</p>