add option to display vertex in meshViewer and re add in the cmake list
updating with DGtal renaming
Merge pull request #1 from kerautret/MeshViewerReAdd

Mesh viewer re add
Merge branch 'master' of github.com:DGtal-team/DGtalTools
add crop
cmakelist
merge from master
 update according generic reader/writer
Merge branch 'master' of github.com:DGtal-team/DGtalTools into cropVolumeTool
merge from master
  NOP reload travis
Merge pull request #45 from kerautret/cropVolumeTool

Crop volume tool