Removed unused imports.
Using validate_uuid function from existing utils module.
Added missing __init__.py
Removed unused json_error function.
Moved utility functions into a separate module.
Moved data loading functions into a separate module.
Undo changes made to default server address.
Removed unused variable.
Split views into several blueprints.
Moved Flask initialization code into create_app function.
Moved server.py file out of acousticbrainz package.
Fixed references to views.
Updated incorrect reference to variable in config file.
Code style tweaks.
Replaced custom UUID validator with Flask-UUID extension that allows marking UUIDs in routes.
Updated uWSGI config.
Updated README.md file.
Merge pull request #51 from tsukanov/refactoring

Module structure improvements