Revert back changes for VTK 5.10
Fix: get back the old behavior of 'r' switch

Thanks Alexandru for pointing this out
Merge pull request #77 from nizar-sallem/fix_interactor_style

Fix: get back the old behavior of 'r' switch
Merge pull request #78 from nizar-sallem/vtk_5_10_fix

Revert back changes for VTK 5.10