TODO

Catch and display uncaught exceptions - tricky because of async

Rack::SockJS should expect to be mapped, not get called with a prefix

Extract FSM execution to module

Unpack Transport#response - it's three methods

Refactor graph of Transport/Response/Session/Buffer - it's crazytown

Study and document relationship of actors in the responses

Why is Rack::SockJS difference from SockJS::Connection?  Merge or document

Override pattern for get_session (or at least find_session)

format_frame/1 -> format_frame/2
open!/0 -> open!/2

Remove alter_ego

Review callbacks...

Review/remove Forwardable