argparse: Convert mopidy command
argparse: Convert mopidy-scan command
docs: Add argparse conversion to changelog
commands: Move --show-{config,deps} handlers to new module
commands: Move argument parser to commands module
config: Switch to ordered dict
spotify: Just check if we are connected, do not wait until timeout
commands: Use argparse to split config files into a list
command: Move override parsing into module
commands: Update override parsing tests
Merge pull request #441 from jodal/feature/argparse

Switch from optparse to argparse
Add mention of mopidy-convert-config
Merge pull request #444 from dz0ny/patch-1

Add mention of mopidy-convert-config
docs: Fix logging config link
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)