Add mention of mopidy-convert-config
docs: Fix typo and level of header
docs: Use 'config' more consistently
docs: Remove mixers' module docs
docs: Add section on extension config and disabling
docs: Add glossary (fixes #430)
docs: Add how to get good sound on raspis (fixes: #299)
docs: Review Raspi sound quality howto
docs: Fix typo
docs: Fix dist-upgrade command (fixes #470)
docs: Fix dist-upgrade command (fixes #470)
(cherry picked from commit 31ef29e1216a856a3ce72551516ef61ea4af7701)
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
docs: Fix link to rpi-update