Cleanup cellset explicit

Cleans up minor issues with CellSetExplicit. Also adds a tests to verify that #37 (closed) has been resolved.

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Branch-at: 8bc40880
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Branch-at: 8bc40880

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vtk-m-delve-windows-static-release+64bit_ids+benchmark+cuda_compute20+tbb+vs-2013: failed
vtk-m-agora-linux-shared-debug+64bit_ids+pgi: failed
vtk-m-delve-windows-static-release+64bit_ids+cuda_compute20+tbb+vs-2010: failed
vtk-m-dejagore-linux-shared-debug+64bit_ids+cuda_compute20+gcc: failed
vtk-m-renar-linux-static-release+32bit_ids+clang-3.5+cuda_compute20+cuda_host_gcc+tbb: failed
vtk-m-dragnipur-osx-static-debug+64bit_ids+clang+examples+tbb: succeeded
vtk-m-dejagore-linux-shared-debug+64bit_ids+clang+tbb: succeeded
vtk-m-dragnipur-osx-static-release+64bit_ids+benchmark+icc+tbb: failed
vtk-m-agora-linux-shared-debug+64bit_ids+icc: succeeded
vtk-m-renar-linux-static-release+32bit_ids+benchmark+clang-3.5+cuda_compute35+cuda_host_gcc+tbb: succeeded
vtk-m-dragnipur-osx-static-debug+32bit_ids+benchmark+examples+icc: succeeded
vtk-m-dejagore-linux-shared-debug+32bit_ids+clang+cuda_compute20+cuda_host_gcc: succeeded
vtk-m-dragnipur-osx-static-release+32bit_ids+benchmark+clang: succeeded
vtk-m-delve-windows-static-release+32bit_ids+benchmark+tbb+vs-2013-x32: succeeded
vtk-m-renar-linux-static-release+64bit_ids+benchmark+cuda_compute35+gcc-4.8+tbb: succeeded

Commit: 8bc40880

Do: merge

Branch successfully merged and pushed!

Status changed to merged

mentioned in commit ac48e13c