code: function onFileChanged(event) {
  		if(event && event.type === 'Changed' && Array.isArray(event.modified)) {
  			//event = {type, files: [{name, location, metadata: {contentType}}]}
  			event.modified.forEach(function(file) {
  				if(typeof file === 'string') {
  					_cache.remove(_getKey(file));
  				}
  			});
  		}
  	}
docs: Callback from the FileClient
  @param {Object} event a <tt>fileChanged</tt> event