dump http2 version to draft-10
renumbering
remove request/response context
remove flowctl flag
move HEADERS frame header decoding
add FrameMap
add Frame Channel
remove conn.ReadResponse/ReadRequest
remove DefaultSeetingsBase64
move handler to tmp
move server to tmp
move HeaderFrame DecodeHeader to stream
move hanshake process to transport.Connect()
merge FrameMap
fix util test
add comments
remove unused context
add conn.WriteLoop() and use FromStream chan to write
remove comment
merge draft-10