Default 'arch' and fix environment variable copy#2

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brendanlong wants to merge 2 commits intobryancatanzaro:masterfrom brendanlong:master

+7-7

Commits on Dec 8, 2015

Let nvcc figure out it's own default for 'arch' and add new values.
brendanlong
committed
Change environment copying to copy anything in the environment if it starts with NV or CUDA.
brendanlong
committed