replaced calls to setsockopt/getsockopt with set/get

Relates to txZMQ issue #39.

Fix bug introduced by api changes to pyzmq (core/socket.pyx).
Double compat checking (ridiculous!)
Compatibility with both old and new pyzmq (13.0.0 and 2.2.0.1)
Add Alexander Else to AUTHORS.
Require at least pyzmq 2.2.+
pyzmq 13.0 compatibility.
Update to 0.6.2.
Update FSF address.
Docs for txZMQ, first words.
Use pyzmq for both pypy and CPython. #47
Drop support for pyzmq < 13. #47
txZMQ 0.7.0 with support for pyzmq >= 13.
Add Travis CI configuration.
Fix package name.
One more package name fix.
Trying with ZMQ 3.
Add pypy to build, verify with different reactors.
Try to build in travis's virtual env.
Fix variable usage.
Comment out PyPy 1.9.