package: eslint-plugin-fbjs

[zpao]

We'll start putting our eslint rules here and use them in conjunction with eslint-config-fbjs (or not, up to consumers).

cc @yungsters @zertosh

[zpao]

Note: we also currently have a number of rules that we should try to contribute to third party projects (eg https://github.com/gajus/eslint-plugin-flowtype).

[sophiebits]

Sweeet.