reset(a, b, life, easing) {
    this.a = ArraySpan.createArraySpan(a);
    this.b = ArraySpan.createArraySpan(b);
    life && super.reset(life, easing);
  }
Reset this behaviour's parameters

@method reset
@memberof Proton#Proton.Color
@instance

@param {Proton.ArraySpan | String} a the string should be a hex e.g. #000000 for black
@param {Proton.ArraySpan | String} b the string should be a hex e.g. #000000 for black
@param {Number} [life=Infinity] 	this behaviour's life
@param {String} [easing=easeLinear] 	this behaviour's easing