Merge pull request #9 from NVlabs/0.9.3

Update download link to 0.9.3
Merge pull request #10 from NVlabs/0.9.3

Update download link to 0.9.3
- Update makefile for stricter floating point accuracy on host code (to
properly measure correctness
- Update performance for global histogram
Merge pull request #11 from NVlabs/master

Minor windows compilation fix