Add `environment` config option to docs
Add `environment` config option to docs

Mappy/raven-js,housinghq/main-raven-js,housinghq/main-raven-js,getsentry/raven-js,getsentry/raven-js,getsentry/raven-js,Mappy/raven-js,housinghq/main-raven-js,getsentry/raven-js,Mappy/raven-js