Make the TimeScale typeCoercer safe
Revert back to 0.29.1

Going back in time...
Merge branch 'release-0.30.0'

Actual release of v0.30.0

Conflicts:
	plottable-dev.d.ts
	plottable.zip
Merge branch 'release-0.31.0'

Conflicts:
	plottable.zip
Merge branch 'release-0.32.0'

Conflicts:
	plottable.zip
Plots default to using positiveOffset if datum value is 0
If all negative/0 values, use negative offset
Check is on dataset basis
code cleanup and modifying getDrawer on only the specific renderer
renderer -> stackedPlot
Merge pull request #1158 from palantir/stackedArea0

[Hotfix --> develop] - Stacked Area with 0 valued datum uses the positive offset value