Add documentation for new `transport` config option
Add documentation for new `transport` config option

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