Add const to read-only nghttp2_frame* parameter in callbacks
nghttp: Use before_frame_send_callback to check stream_id
Call nghttp2_hd_end_headers from nghttp2_hd_deflate_hd
Merge branch 'bagder-master'
Fix typo
nghttp2.h: avoid compiler warnings due to comma after last enum

warning: comma at end of enumerator list [-Werror=pedantic]
nghttp2_version: new function, returns info about this nghttp2

This returns run-time information about the lib
NGHTTP2_VERSION_NUM: have configure generate the define
nghttp2_info: Format doc for API doc generator
Update doc
doc: Include header files in documentation
Merge https://github.com/tatsuhiro-t/nghttp2
Merge branch 'master' of github.com:bagder/nghttp2