Add Authentication
review comment updates
Fix string format to work with Python 2.6 too
Convert to top level function
Install libsodium to run tests with curve feature
Rework design to separate authentication logic
Rework design to separate authentication logic
Cleanup
switch to ppa
Cleanup
Merge pull request #452 from ticosax/run-curve-tests

Install libsodium to run tests with curve feature
Merge branch 'master' of https://github.com/zeromq/pyzmq into add_auth
Cleanups
Add security examples
Add IOLoop auth tests and cleanup
remove accidental print statement
Remove verbose flag, logging is sufficient
skip auth tests on Python 3
Merge pull request #451 from claws/auth

add zmq.auth implementation of ZAP

doesn't yet support Python 3.
add errors option to cast_bytes/unicode