Update authentication to use updated spdystream interface

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Merge pull request #25 from dmcgowan/spdystream_update

Update authentication to use updated spdystream interface
Goimporting libchan repo, so travis will be happy

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)