hcc - support for multiple devices#1

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scchan wants to merge 3 commits intopsteinb:hccfrom

scchan:multigpu_debug

Commits on Aug 16, 2016

allocate array and launch kernel on the selected device
scchan
committed

Commits on Aug 29, 2016

changing references hc::array to local references in order to avoid the capturing the this pointer into the kernel, experimenting with placement new into coarse grained memory
scchan
committed

Commits on Sep 2, 2016

remove debug code and messages
scchan
committed