skipped superbuild in travis.yml and build against vtk6
skipped superbuild in travis.yml and build against vtk6

livia-b/statismo,kaspermarstal/statismo,statismo/statismo,heartvalve/statismo,kaspermarstal/statismo,livia-b/statismo,statismo/statismo,heartvalve/statismo,statismo/statismo,statismo/statismo,heartvalve/statismo,kaspermarstal/statismo,kaspermarstal/statismo,heartvalve/statismo,livia-b/statismo,livia-b/statismo