[examples/chat] now serves a web engine.io client
[examples/chat] added node client
[polling_xhr] fixed write bug when binary isn't supported
Minor changes to state checking
Fixed polling bug when upgrading, cleaned up logging a bit
socket/transport closes are now handled correctly
Implemented JSONP Polling transport
Return upgrade errors, proper long-polling
Implemented upgrade timeouts
Fixed bug where "noop" wasn't sent when upgrading