Add support for alternate hostnames with --sni-name=

Clean up some warning

Re-enable support for weak (<1024 bit) DH keys. Fixes rbsec#97

Update changelog

Cleanup default port selection code

Proper fix for the missing EXPORT and 56bit SSLv2 ciphers. Fixes rbse…

…c#77

The previous fix of using enable-ssl2 and enable-weak-ciphers was
incomplete, because the 40 and 56bit SSLv2 ciphers were still disabled.
There's no option to re-enable them - they're commented out with #if 0
statements.

Building against a previous tag will mean missing out on future
features, so as a workaround the Makefile now replaces those #if 0
statements with #if 1 to re-enable the ciphers.

Bit of a bodge, but doesn't seem to break anything, and will allow us to
keep building against the latest version.

Better fix for SSLv2/EXPORT cipher changes. Fixes rbsec#77

Updated readme and changelog. rbsec#69

Updated readme and changelog. rbsec#69

Merge cipher_order into master