whitelist index.js. This leaves out tests from npm installs
whitelist index.js. This leaves out tests from npm installs

Summary:
Read more about this feature here: https://docs.npmjs.com/files/package.json#files
Closes https://github.com/facebook/watchman/pull/375

Reviewed By: mostafaeweda

Differential Revision: D4206539

Pulled By: wez

fbshipit-source-id: b0d060912ad3745d52ab16a608735ba2c6d1e967

kwlzn/watchman,nodakai/watchman,kwlzn/watchman,facebook/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,wez/watchman,nodakai/watchman,facebook/watchman,kwlzn/watchman,facebook/watchman,wez/watchman,facebook/watchman,kwlzn/watchman,wez/watchman,wez/watchman,wez/watchman,nodakai/watchman,kwlzn/watchman,kwlzn/watchman,wez/watchman,facebook/watchman,kwlzn/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,wez/watchman,wez/watchman,wez/watchman,nodakai/watchman,nodakai/watchman