function MdContactChipsCtrl ($attrs, $element, $timeout) {
  /** @type {$element} */
  this.$element = $element;

  /** @type {$attrs} */
  this.$attrs = $attrs;

  /** @type {Function} */
  this.$timeout = $timeout;

  /** @type {Object} */
  this.selectedItem = null;

  /** @type {string} */
  this.searchText = '';

  /**
   * Collection of functions to call to un-register watchers
   * @type {Array}
   */
  this.deRegister = [];

  this.init();
}
Controller for the MdContactChips component
@constructor