Travis : Disable GCC build (don't work with GCC travis release)
Revert "nghttpx, nghttpd: Check pseudo header fields come before normal header fields"

This reverts commit cc24b9aaf0839e1302795c97519ff46e4fbadc3f.
Add make check to Travis
nghttpd, nghttpx: Check that pseudo headers come before normal headers
nghttp: Support non-final response and check pseudo headers
nghttpx: Fail if :status is not digits on http2 downstream
nghttpx: Treat malformed request as PROTOCOL_ERROR
Merge branch 'travis' of https://github.com/alagoutte/nghttp2 into alagoutte-travis
Merge branch 'alagoutte-travis'