code: function storeScreenShot(data, file) {
  	var stream = fs.createWriteStream(file);
  
  	stream.write(new Buffer(data, 'base64'));
  	stream.end();
  }
docs: Function: storeScreenShot
  Stores base64 encoded PNG data to the file at the given path.
  
  Parameters:
  (String) data - PNG data, encoded in base64
  (String) file - Target file path