Add headlights, upgrade PropertyTools package
Coerce number of divisions for RectangleVisual3D
Add CreateMaterial overload that takes brightness of specular color as parameter
Add more options to headlight demo
Added Gitter badge
Add chat link
Merge pull request #64 from gitter-badger/gitter-badge-1

Add a Gitter chat badge to README.md
Move badge
Merge remote-tracking branch 'upstream/master' into features/headlights
Change Materials to properties
Null ref check on positions and triangle indices in `FindHits` by rectangle
Add PointSelectionCommand
Remove console output from unit tests
Update release notes
SelectionCommand: call Started after focusing and capturing the mouse
Change debug output paths
Merge branch 'features/headlights' of https://github.com/objorke/helix-toolkit into objorke-features/headlights
Merge branch 'objorke-features/headlights'
Add unit test #55