Rename LastfmSearch to LastfmSearcher, and LastfmSearchWithLoves to LastfmSearcherWithLoves
Rename LastfmSearchQuery* to LastfmQuery*
Install South
Store the Last.fm connection in it's own model
Rename test_connection.py to test_lastfm_connection.py
Make LastfmConnectionHelper tests more robust

Always re-fetch the LastfmConnection after testing logic that
alters the DB.
Store SpotifyConnection in the DB

- Move the MissingUserError down to parent connection module
- Remove redundant reverse import from lastfm_connection module