core/src/ons/gesture-detector.js
function off(element, type, handler, opt) {
    util.removeEventListener(element, type, handler, opt, true);
  }
function off(element, type, handler, opt) {
    util.removeEventListener(element, type, handler, opt, true);
  }
function off ( element , type , handler , opt ) { util . removeEventListener ( element , type , handler , opt , true ) ; }
simple removeEventListener wrapper
@param {HTMLElement} element
@param {String} type
@param {Function} handler
simple removeEventListener wrapper