function removeAnimator(elem){
prefixed(elem.style, 'transition-timing-function', '')
prefixed(elem.style, 'transition', '')
}
function setPerspective(elem, amount){
prefixed(elem.style, 'perspective', amount + 'px')
}
/**
* shortcut method to translate an element
* @param {Element} el
* @param {Integer} val pixel value to translate
*/
function $translateY(el, val) {
prefixed(el.style, 'transform', 'translateY(' + val + 'px)');
}