Merge pull request #1159 from palantir/stackedArea0

[Hotfix --> master] - Stacked Area with 0 valued datum uses the positive offset value
Merge pull request #1165 from palantir/emptyDatasetFailure

[Hotfix --> master] - [StackedArea] - Projection logic allows for empty datasets
Release version 0.32.1
Covers 0-length dataArray case
Test renames
Modifying test message
Roll IterativeDelay animator class into Base.

Close #1131.
Release v0.33.0-preview
Fix initialization issue.
Example of how rowWeight works
Merge pull request #1181 from rayshan/develop

Example of how rowWeight works
Regenerate built files on develop.
Release version 0.33.0
Changin test name
Merge branch 'release-0.33.0'

Conflicts:
	bower.json
	package.json
	plottable.js
	plottable.min.js
	plottable.zip
Merge pull request #1184 from palantir/master

Master --> Develop to pick up v0.33.0
values coerced to numbers (floats) for stacking
Better test name
Fix numberOfIterations concern.
Merge branch 'develop' into stack0Data