code: function(c1, c2) {
        var axis = this.axis(c1, c2),
            col = true;
  
        for (var i = 0; i < 4; i++)
          col = col && this.axisCollision(axis[i], c1, c2);
  
        return col;
      }
docs: Check whether two rectangles collide on each one of their four axis. If
  all axis collide, then the two rectangles do collide on the plane.
  
  @param  {array}    Rectangle A's corners.
  @param  {array}    Rectangle B's corners.
  @return {boolean}  True if the rectangles collide.