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Merge branch 'master' of github.com:jaredhoberock/thrust into bulk
Integrate improved bulk-based CUDA merge implementation.

Fixes #397
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Integrate Bulk-based CUDA reduce_by_key implementation

Fixes #400
Fixes #318
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Mark 8b TestZipIteratorReduceByKey as a KNOWN_FAILURE on Tesla hw
Merge branch 'master' of github.com:jaredhoberock/thrust into bulk

Conflicts:
	thrust/system/cuda/detail/reduce_by_key.inl
Merge pull request #424 from jaredhoberock/bulk

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