correct documentation of super class method calling
Merge pull request #20 from benjixx/small-doc-fix

docs: Fix example of super class __init__ calling
Update URL to gevent tarball
Refactor tests
tox config: Install gevent for Python 2.6 as well
Add eventlet support
travis: Add Python 3.3 build
Merge remote-tracking branch 'jstasiak/eventlet' into develop
eventlet: README tweaks
eventlet: flake8 and style fixes
eventlet: Add support for future callbacks
docs: Add eventlet support to changelog