Specified stream_user_data_arg can be retrieved by
spdylay_session_get_stream_user_data() function. The application code can use
this function insde spdylay_on_ctrl_send_callback() and identify stream ID
for the request associated by the stream_user_data.
The sample usage is in examples/spdycat.cc.
Conflicts:
examples/spdylay_ssl.cc
tests/Makefile.am
tests/main.c
Changes:
spdylay_select_next_protocol() returns -1 if it fails.
Use cunit without pkg-config because debian does not provide .pc file.
Some doc updates to suite my taste.
Added spdylay_npn.h
