Add musicBrainz service for querying MusicBrainz api

this looks like it should replace echonest which is super swell
Query musicBrainz on artist change before attempting wiki lookup

wiki isn't always solid, e.g. on "grizzly bear" we get the article about
the animal. MusicBrainz has a free, public api which is beautiful. it's
looking like we'll mainly query musicBrainz, get a list of resource
urls, and then query their own respective APIs
Add debug for GET calls