Update to latest Bulk
Some performance tweaks to the CUDA implementation of reduce & reduce_by_key
Merge pull request #535 from thrust/reduce

Reduce
When launching single parallel groups, compute a >= 1 subscription rate
Merge pull request #536 from jaredhoberock/subscription

When launching single parallel groups, compute a >= 1 subscription rate
Eliminate a couple of registers from cuda_task
Memoize the device_properties() function in host code
Avoid calling device_properties() repeatedly in cuda_launcher.
Merge pull request #537 from jaredhoberock/launcher

Launcher