Misc tweaks

* hunchensocket.lisp (websocket-acceptor): Increase timeout to
300.
(print-object): New method for websocket resources.
(call-with-new-client-for-resource): Set client state to :connected.
(write-frame): Remove spurious leftover trace.
* README.md: Fix tutorial to mention chat room in URL
Tests now use fiasco
Add demo.lisp with same program as tutorial