title: checkFile in ng-cordova not working
body: <p>cordova,</p>
  
  <p>I'm liking ng-cordova. I use the downloadFile and it works perfectly. I use it like so:</p>
  
  <p>$cordovaFile.downloadFile(source, 'cdvfile://localhost/persistent/myFolder/newFile.jpg', true).then(..)..</p>
  
  <p>But when I use $cordovaFile.checkFile('cdvfile://localhost/persistent/myFolder/newFile.jpg').then(...), it always returns an error. It seems like it doesn't find the file. </p>
  
  <p>Am I doing it correctly? How do we check for a file using ng-cordova? The docs are sparse but pretty self-explanatory so I'm not sure what else to do. <a href="http://ngcordova.com/docs/#File" rel="nofollow">http://ngcordova.com/docs/#File</a></p>
  
  <p>Google Groups on Phonegap don't mention anything in this light. I've been testing different approaches and file/path referencing but nothing seemed to work. Any help would be much appreciated.</p>
  
  <p>Thanks.</p>