BUG: Fix VTK5 module export code.

Change-Id: Id23d0ed145fc07571ed5d526cb373cee3e977d1e
BUG: Fix LevelSetsv4Visualization VTK variable names.

Change-Id: I91465c1abd1df8707ae915d7e32856a000223144
Merge topic 'vtk5-export'

0cb8ba87 BUG: Fix VTK5 module export code.
BUG: Fix segfaults in ITKExamples

Added necessary compiler definitions for VTK factory mechanism in the
<module>_EXPORT_CODE_* variables to work. This fixes a segfault in
VisualizeStaticDense2DLevelSetAsElevationMapTest where no override was
found for vtkRenderer.

Change-Id: I8a4d438bbb56c5b4e725691bd3b35b3138d669b6
Merge topic 'fix_export_code_commands'

d7a9a31f BUG: Fix segfaults in ITKExamples
Merge topic 'LevelSetsv4VisualizationVariables'

e14fc3ce BUG: Fix LevelSetsv4Visualization VTK variable names.
ENH: Bump CMakeLists.txt version to 4.8.0.

Change-Id: Ied219bb02e623601cdc753e9837f6dc98c38811a
Merge topic 'VersionBump'

18059f91 ENH: Bump CMakeLists.txt version to 4.8.0.