[ADD] Added did animate method to animation delegate

[ghost]

Just created a life cycle method for the animation delegate. It gets called when the presentation animation finished.

[jaredsinclair]

Cool. I worry that implementers might get confused by the duration argument since this is called after the animation is over. Maybe drop that argument?

[ghost]

Yes you are right, i'll fix this.

[GeorgesAlkhouri]

Changed it.