Added USELIBPCRE to make use of regex engine
        optional.

        Added support for RFC4366 SNI and RFC7301 ALPN
        (Travis Burtrum)

        Changed connection log to include the name of the probe that
        triggered.

        Changed configuration file format: 'probe' field is
        no longer required, 'name' field can now contain
        'tls' or 'regex', with corresponding options (see
        example.cfg)
        Added 'log_level' option to each protocol, which
        allows to turn off generation of log at each
        connection.
        Added 'keepalive' option.