improve build logs experience (#1982)
improve build logs experience (#1982)

* [turtle] add watch-mac target back to Makefile

* [exp] change local build logs url

* [turtle] save logs as json objects

* [www] add support for displaying logs in json format

* [turtle] use watchman instead of reflex

* Revert "[turtle] use watchman instead of reflex"

This reverts commit 3171dcdd82b9f2617f95c9c4e23c19588b7cea16.

* [turtle] print logs from stderr as info

* [turtle] use bash instead of zsh in watch-mac command

* [www] don't make all logs from stderr red

* [turtle] save data fields in log json object

* [turtle] sanitize whole json string instead of just message field

fbshipit-source-id: 6cfaf15

exponentjs/exp