code: function(v, max) {
      return sign(v) * (max - Math.min(max, Math.abs(v)));
    }
docs: flips 0->max to max<-0 and 0->min to min->0
  In otherwords
  max: 3, v: 2.7  =  0.3
  max: 3, v:-2.7  = -0.3
  max: 3, v: 0.2  =  2.8
  max: 3, v:-0.2  = -2.8
  
  @param {Number} v value to flip.
  @param {Number} max range to flip inside.
  @returns {Number} flipped value.
  @memberOf module:Misc