Restructured wrappers for external APIs.
Added function that loads info about multiple release groups in parallel.
Changed the process of setting namespace for memcache.
Improvements in cache helper module. Now loading defaults directly from config files.
Added more documentation.
Cleanup in mbspotify module.
Removed function that loads info about multiple release groups.
Removed unused import.
Improved logging initialization process.
Various documentation improvements.
Merge branch 'modules' into browsing

Conflicts:
	critiquebrainz/frontend/__init__.py
	critiquebrainz/frontend/apis/mbspotify.py
	critiquebrainz/frontend/apis/musicbrainz.py