Merge pull request #1 from sampsyo/master

implement entity searching
Merge pull request #2 from sampsyo/master

Search fields by keyword arguments
License, contributor credits
Remove debugging
tests
setup
Require client to be set for post requests

Closes #13
Add debug logging
Send login details with user-tag/rating requests
Add missing entities
Read user ratings and user tags

Closes #7
Add ability to send PUT and DELETE requests
Collections support

Fixes #15
Allow artist credits

Also parse an artist credit list into a phrase
Fixes #5
allow various-artists in artist entities

Fixes #6
Filter by release types and release statuses

Fixes #9
Add missing elements

release-group / first-release-date
release / packaging
release / asin
Browse support

Fixes #11
Includes for browse methods
relationships support

fixes #8