code: function getCenter(touches) {
      var pageX = []
        , pageY = []
        , clientX = []
        , clientY = [];
  
      Utils.each(touches, function(touch) {
        pageX.push(touch.pageX);
        pageY.push(touch.pageY);
        clientX.push(touch.clientX);
        clientY.push(touch.clientY);
      });
  
      return {
        pageX: (Math.min.apply(Math, pageX) + Math.max.apply(Math, pageX)) / 2,
        pageY: (Math.min.apply(Math, pageY) + Math.max.apply(Math, pageY)) / 2,
        clientX: (Math.min.apply(Math, clientX) + Math.max.apply(Math, clientX)) / 2,
        clientY: (Math.min.apply(Math, clientY) + Math.max.apply(Math, clientY)) / 2
      };
    }
docs: get the center of all the touches
  @param   {Array}     touches
  @returns {Object}    center