Merging in pull request 15, along with a few minor updates.
README.md touch ups.
fix-up multi-disc tagmap logic in taggerutils.py
Changes to default .conf file, as there are some outstanding bugs with multidisc tagging.
- cache the tracks @property.
- update disc_and_track_no to support easier disc/track position matching,
  discogs.com doesnt appear to have a clear standard on how discs are split.
bugfix: ensure we yield the name property from artist object
cleanup: remove temp debugging data.
Merge branch 'master' of github.com:triplem/discogstagger