dist/impetus.js
function onUp(ev) {
            var event = normalizeEvent(ev);

            if (pointerActive && event.id === pointerId) {
                stopTracking();
            }
        }
function onUp(ev) {
            var event = normalizeEvent(ev);

            if (pointerActive && event.id === pointerId) {
                stopTracking();
            }
        }
Handles up/end events
@param {Object} ev Normalized event