Require CMake 3.8 to build VTK-m.

CMake/VTKmCPUVectorization.cmake

CMake/VTKmCheckCopyright.cmake

CMake/VTKmCheckSourceInBuild.cmake

CMake/VTKmCompilerFlags.cmake

CMake/VTKmConfig.cmake.in

CMake/VTKmDeviceAdapters.cmake

CMake/VTKmRenderingContexts.cmake

CMake/VTKmWrappers.cmake

CMakeLists.txt

README.md

docs/changelog/1.3/release-notes.md

docs/changelog/cmake-38-required.md

examples/clipping/CMakeLists.txt

examples/contour_tree/CMakeLists.txt

examples/cosmotools/CMakeLists.txt

examples/demo/CMakeLists.txt

examples/game_of_life/CMakeLists.txt

examples/hello_world/CMakeLists.txt

examples/histogram/CMakeLists.txt

examples/isosurface/CMakeLists.txt