Added quick reinstall --HEAD fix for watchman https://github.com/facebook/watchman/issues/90
Hopefully alleviates new issues getting created for similar problems. Addresses https://github.com/facebook/react-native/issues/257 https://github.com/facebook/react-native/issues/304 https://github.com/facebook/react-native/issues/306 https://github.com/facebook/react-native/issues/326