Cox multivariate#467

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abhiwand wants to merge 7 commits intotrustedanalytics:masterfrom

abhiwand:DPNG-7943

Commits on Aug 30, 2016

Updated Cox code
abhiwand
committed

Commits on Aug 31, 2016

Cleanup of Cox code
abhiwand
committed

Commits on Sep 1, 2016

Renamed Cox to CoxPh
abhiwand
committed

Commits on Sep 2, 2016

Merge branch 'master' of github.com:trustedanalytics/atk into DPNG-7943
abhiwand
committed

Commits on Sep 7, 2016