Merge pull request #1 from Slicer/master

Merge 10/6/14
ENH: Add HeterogeneityCAD
Merge pull request #774 from vnarayan13/master

Add HeterogeneityCAD Module
ENH: Update ShapePopulationViewer from revision f9e2c1d832096e7d17dc4e8ff9bce6f91f2eebb6 to 6acb3f91b2039e0f4c5c45d8d4fcb7bf5a523bf0

https://www.github.com/NIRALUser/ShapePopulationViewer/compare/f9e2c1d832096e7d17dc4e8ff9bce6f91f2eebb6%E2%80%A66acb3f91b2039e0f4c5c45d8d4fcb7bf5a523bf0