Fix compilation and axis issue with VTK 5.10
Fix: set EIGEN_ROOT to get absolute path

This is the fix for issue #990 as suggested by Brian Wachter
Merge pull request #67 from nizar-sallem/vtk_5_10_fix

Fix compilation and axis issue with VTK 5.10.1
Merge pull request #71 from nizar-sallem/fix_eigen_root

Fix: set EIGEN_ROOT to get absolute path