Check if there are associated acts before querying for them
Insert the Assoc. Act relationship in pairs (a, b) where a < b, and use
MySQL's REPLACE statement to work around key collisions
Initializing the _node attribute in the Plugin class
Renamed the InfoboxPlugin to ArtistInfoboxPlugin
Blank line fix
Ditched the Use of the enum Module

Brought more problems than solutions so I just ended up implementing our
own version of enums in Python... this is 2013, btw.
Added Handling of Artist Genres

Added the GenreInfoboxPlugin, ArtistGenreRelationship,
SubgenreRelationship (currently not stored in the DB), GENRE node type
and all required store queries in the miner. There's still an issue with
detecting two mentions of the same genre using different names (like
lowercased vs first uppercased).