Updates to device scan
more work on device-wide scan
device scan
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More scan work
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Updates to exchange and load/store for timeslicing
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Merge pull request #8 from NVlabs/master

Pull into development repo
Docs
Begin refactor to 3-paramset collectives
Convert warp reduce to construct-then-op.  SHFL warp-reduce now works 
on any type.
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