Add a configuration section that lists all options for each plugin.
List options in alphabetic order.
Mention the default value for each option.
Use same sentences to describe concepts common to different plugins eg 'auto
option, install description
Renamed fuzzy_search to fuzzy and rdm to random. These names should be easier
to remember since they are the same as the commands they provide.
--HG--
rename : beetsplug/fuzzy_search.py => beetsplug/fuzzy.py
rename : beetsplug/rdm.py => beetsplug/random.py
rename : docs/plugins/fuzzy_search.rst => docs/plugins/fuzzy.rst
rename : docs/plugins/rdm.rst => docs/plugins/random.rst
