• added test/Makefile.in to the release tar ball, so that peopl just need
  automake to build (reported in #169 by @uhliarik, fix proposed by @notroj)
• added -avoid-version to the linker flags (thanks to Oden Erikson, @odeneriksson)
• added tests for 100 interim responses
• added tests for trailers
• added tests for conditional request header
• added tests for invalid characters in response header
• added Upgrade: response header tests
• added vars require configuration tests
• added ssl renegotiation tests