plot.animateOnNextRender added

used to only animate the first time a _render() is
called, or when data changes
Merge branch 'master' into animate-once

Conflicts:
	plottable.js
	src/core/plot.ts
no animate on scale.broadcast
remove() no longer sets plot.animateOnNextRender
Core.ResizeBroadcaster.resizing() check removed
quicktest updated
animate on resize(), not on renderTo()
Merge branch 'master' into animate-once

Conflicts:
	plottable.js
Merge pull request #619 from palantir/animate-once

plot.animateOnNextRender