801 - Adding animations for stacked bars
Adding stacked bar animate to quicktest

Also minor formatting fixes
Using number primitive type in animator.ts
Refactor to shorten animate code
Removing redundant typings
moving getAnimatedAttributes into a private static var
Merge branch 'develop' into 801-stackedBarsAnimation

Conflicts:
	plottable.d.ts
	plottable.js
Merge pull request #861 from palantir/801-stackedBarsAnimation

801 - Adding animations for stacked bars