HTTP/2 RFC conformance (h2spec 145/145), flow control, connection-reu…

…se fix

Merge pull request #71 from ToughLad/master

Fix HTTP/2 build error by implementing RoundTripper adapter

Update README.md

Client cancel requests & timeout. HPACK tests. GOAWAY handling

Added test case for #27

Fix timer arming. New tests. Count open streams correctly

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