Use TLS instead of SSL 3.0.

SSL 3 is on its way out, and will be disabled by default in November's release of Firefox: https://blog.mozilla.org/security/2014/10/14/the-poodle-attack-and-the-end-of-ssl-3-0/
Merge pull request #24 from keturn/tls-not-ssl3

Use TLS instead of SSL 3.0.