Update lint_blacklist to include node_modules. Remove js_version.py from source control

Summary: Cosmetic fix, but it was bothering me a lot

Test Plan:
js_version.py is ignored and node_modules is not linted
on commit

Reviewers: csilvers, alpert

Reviewed By: alpert

Differential Revision: http://phabricator.khanacademy.org/D3712