Reduce transport interface and expose underlying spdy transport

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Remove pipe implementation from exposed interface

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Add ByteStreamWrapper to transparently copying ReadWriteClosers

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)