802 - Horizontal mode on stackedBarPlots
Refactor to less block code
Merge branch 'develop' into 802-horizontalStackedBarPlots

Conflicts:
	plottable.d.ts
	plottable.js
	src/components/plots/stackedBarPlot.ts
Resolving conflicts
Merge pull request #899 from palantir/802-horizontalStackedBarPlots

802 - Horizontal mode on stackedBarPlots