Enable all supported protocols including TLSv1.1 and 1.2

This enables support for TLSv1.1 and 1.2.

However, it also enables support for all other supported protocols (inluding legacy SSL). Do we want to support legacy SSL (though it's been proven insecure) for older servers (does Gmail support TLS for c2s connections?), or should I change it to only add support for more modern versions of TLS?