Add Support for zmq_msg_gets to enable Reliable auth
Remove the hack that assume immediate next message after a zap request

was the message related to it.

Now there is reliable authentication !
Allow usage of latest tornado
Be nice with older versions of libzmq
Test with libzmq 4.1 and before
Bump small version number

because Reliable auth feature will break backward compatibility
Update documentation
Merge pull request #58 from ticosax/reliable-authentication

Reliable authentication