Fix connection close when Transport timeout

[datso]

Here is my workaround for problem #334 .
Without closing the connection, "eventsource" transport will send request's to server even after "onclose" callback.

[brycekahle]

It does not make sense to call close when the open event has not been emitted (the timeout). Let's continue the discussion in the issue.

[brycekahle]

I apologize. I believe I understand the situation now. This does seem correct. I am slightly worried that transports may emit close events in this flow and cause a double call of _transportClose. I will try to investigate that, but this seems correct.

[brycekahle]

@lpinca I'll try and do that this evening (UTC-4).

[lpinca]

Thank you.

[brycekahle]

1.1.5 released