Change permissions for tools/*.py (#145)

Summary:
This commit changes permissions for *.py files in tools/ to 744 so that owners have the permissions to read, write and execute.

Pull Request resolved: #145

Reviewed By: pdollar

Differential Revision: D28588778

Pulled By: rajprateek

fbshipit-source-id: 92e5e11126fe3134766a5e264ba881e6140b6d47

Add model weight URLs for dds baselines

Summary: Adding all URLs for model weights stored in S3.

Reviewed By: pdollar

Differential Revision: D21046628

fbshipit-source-id: c1e7c033dc5f226f42df633a8b0a969614334c64