fix bug thinko

fix bug thinko on the last line
Merge pull request #11 from mattkeenan/master

fix bug thinko
Add Framer.WriteRawFrame, add max frame tunable, reject large frames.

Also fix server GOAWAY handling in the process, and start to work on
reducing idle connection memory pinning, by making the frame reader
only block reading into a 9 byte buffer, opening the door to making
the rest of the frame buffer be lazily allocated.
Merge branch 'master' of github.com:bradfitz/http2
Buffer the writing of frames.

Previously each written frame went in its own network packet.

Now we buffer until the frame writer has nothing else to write, at
which point it flushes and discards its write buffers, to minimize
the memory usage of idle connections.
Add AUTHORS and CONTRIBUTORS files.