Pass metadata to projectors in interactions.
Merge branch 'develop' into interaction_metadata
Metadata on AbstractBarPlot.
Formatting.
Merge branch 'develop' into interaction_metadata
Underscore private method.
Merge branch 'develop' into interaction_metadata

Conflicts:
	plottable.js
	src/components/plots/abstractBarPlot.ts
Merge pull request #1345 from palantir/interaction_metadata

Pass metadata in interaction.
Merge branch 'develop' into stackedAreaExtends