Add WriteHeader, fix ErrShortWrite-always bug, add Framer.AllowIllegalWrites
add TODO
add Framer.WriteContinuation
update package comment
Unexported ErrCodeName, add some comments on error types
PRIORITY reading and writing.
add more Dockerfile comments
Remove the old h2server directory for now.

The Docker+curl tests are better.
add a README
update ConfigureServer docs
add Framer TODO for size limits
SETTINGS writing.
Terrible, temporary HPACK encoder.

Placeholder to unblock other development.
start spec test coverage
replace xml.Unmarshal with recursive parse

Unmarshal doesn't provide us with a way to only extract the text without
the innerxml.
generate spec coverage report