GitLab

Summary:
Pull Request resolved: https://github.com/facebookresearch/d2go/pull/392

1. Moved scale adjustment to a separate function and expose the option to disable it
2. Add option to keep the original image instead of creating a square image

Reviewed By: wat3rBro

Differential Revision: D40403705

fbshipit-source-id: 6c35a9a1fe3ef868e5f0b2204874fd028776e26a