Clear a search
@return {void}
function() {
  if (this.config.searchable || this.config.taggable) {
    this.input.value = null;
    this.searching = false;
    if (this.config.searchable) {
      util.removeClass(this.inputContainer, "active");
    }

    if (util.hasClass(this.container, "notice")) {
      util.removeClass(this.container, "notice");
      util.addClass(this.container, "open");
      this.input.focus();
    }

    util.each(this.items, function(i, item) {
      // Items that didn't match need the class
      // removing to make them visible again
      util.removeClass(item, "excluded");
      // Remove the span element for underlining matched items
      if (!this.customOption) {
        item.innerHTML = item.textContent;
      }
    }, this);
  }
}