message: docs(popover): add more complicated(new) example for Custom triggers demo
  Add Double click event and Input change event triggers exaples
  Close
diff: +<div class="row">
  + <div class="col-md-2">
  <button type="button" class="btn btn-info"
  popover="I will hide on blur"
  triggers="mouseenter:mouseleave">
  Hover over me!
  </button>
  + </div>
  + <div class="col-md-2">
  + <button type="button" class="btn btn-info"
  + popover="Double click one more time"
  + triggers="dblclick">
  + Double click me!
  + </button>
  + </div>
  + <div class="col-md-8">
  + <input type="text"
  + class="form-control"
  + placeholder="Show popover on input change"
  + popover="I will hide on blur"
  + triggers="keypress:focusout">
  + </div>
  +</div>
  