Add linear activation
Add linear activation

Summary: Pull Request resolved: https://github.com/fairinternal/fairseq-py/pull/698

Differential Revision: D16068477

Pulled By: myleott

fbshipit-source-id: a68f6f519dc5481f857d8e10cc443249eccb2545

pytorch/fairseq,pytorch/fairseq,pytorch/fairseq