 options of the Timeline can be changed live.

        The displayed options can be filtered by providing a filter function. This function is invoked with two arguments: the current <code>option</code> and the <code>path</code> (an Array) of the option within the options object. The option will be displayed when the filter function returns true. For example to only display format options:
        <pre class="prettyprint lang-js">
function (option, path) {
  return option === 'format' || path.indexOf('format