Merge changes to VR plugin
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
http://review.source.kitware.com/#/t/1953/
d09367c2 Update sample VR state file with input roles attributes. 346dd1ae Fix typo in comment. 8a3244a4 Set event queue on connections when they are added... 3d29d76c Fix bug in VR input / role mapping. b28aba0b Add missing header to vtkVRUIPipe.cxx 7c642416 Filter the VR property combo to only show compatible entries.