Update to latest bulk
Merge pull request #436 from jaredhoberock/bulk

Update to latest bulk
Workaround unused variable warnings in CUDA's scan implementation.
Merge pull request #437 from jaredhoberock/small-fixes

Workaround unused variable warnings in CUDA's scan implementation.
Actively check for clang
Merge pull request #438 from FilipeMaia/master

Actively check for clang