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Merge pull request #718 from Yangqing/dev

More namespace cleaning.
More namespace cleaning.
remove 2 using per jeff's comment
fixing std::min and std::max and std::abs: using them in default will make nvcc unhappy.
lint
cosmetics: add syntax=proto2 to protobuffer files.
Merge branch 'dev' of https://github.com/Yangqing/caffe into dev