Score update methods should be object properties

[ethanroday]

Update methods should be eliminated and replaced with Object.defineProperty() for the properties involved. For example,

Renderer.Chord.prototype.update = function(duration,numDots,articulation) {
    this.updateDuration(duration);
    this.updateNumDots(numDots);
    this.updateArticulation(articulation);
};

and the methods that it calls should in turn be refactored into three Object.defineProperty() calls: one for duration, one for numDots, and one for articulation.