Update to tls-1.2, drop the dependency of tls-extra.
Simplify datatype XmppTlsError.
Merge branch 'master' of git://github.com/rnons/pontarius-xmpp
give TLS necessary information to check certificates
fix connection to google talk servers failing

google talk only supports RC4 as TLS cipher
fix defined condition picklers being too strict
Use realm as TLS for server identification

... if clientServerIdentification is set to the empty string