v0.3 (flashlight#543)

Summary:
Cut v0.3 stable.

Pull Request resolved: flashlight#543

Reviewed By: tlikhomanenko

Differential Revision: D27830422

Pulled By: jacobkahn

fbshipit-source-id: 329a100dfeb0635cf993f05a12eee72e50de695f

fix of adam optimizer as pointed in flashlight#143

Summary: fix for flashlight#143

Reviewed By: syhw, jacobkahn

Differential Revision: D22757150

fbshipit-source-id: 1c9267a7a594f7d3b7041389b7e40715cb14e6b4

readthe docs integration 2