whole_func_string: function listenSelector(selector, type, callback) {
      return delegate_1(document.body, selector, type, callback);
  }
func_code_string: function listenSelector(selector, type, callback) {
      return delegate_1(document.body, selector, type, callback);
  }
func_documentation_string: Add an event listener to a selector
  and returns a remove listener function.
  
  @param {String} selector
  @param {String} type
  @param {Function} callback
  @return {Object}