title: Angularjs-Slider onchange event not firing up doesn't work
body: <p>how to handle change event on angularjs rzslider:</p>
  
  <pre><code>&lt;rzslider  rz-slider-model="range_slider_ticks_values.minValue" rz-slider-high="range_slider_ticks_values.maxValue" rz-slider-options="range_slider_ticks_values.options"&gt;&lt;/rzslider&gt;
  </code></pre>