reqs: Remove external mixers deps, as it was split out to its own package
reqs: python-ws4py is available in Ubuntu 13.04 and Debian testing
reqs: unittest2 not required when on Python 2.7
setup: Remove Python 2.6 PyPI classifier
fab: Add more targets, remove nose config file
docs: Update authors
docs: Unbreak docs building by mocking dbus.String properly
docs: Fix link on Travis badge