• accepting "h2" on Upgrade: headers and allowing also Upgrade to work on TLS
  connections that talk HTTP/1.1.
• logging WARNING once when mod_h2 is used in a "prefork" mpm configuration.
  There seem to be issues with mod_proxy/rewrite and dankging I/O.
• added test suites for combinations with mod_proxy and mod_rewrite
• added test for request with Host: header where h2 is not enabled
• sandbox now builds local openssl 1.0.2 if 1.0.1 or older are installed
  on the system. Prior 1.0.1 was accepted, but NPN support will be disabled
  soon.
• added "Known Problems" section in README
• direct mode should also work with TLS connections, untested currently.