Add authorization and per-user scrobbling

The webhook endpoints now require a token before it will accept a
scrobble. That auth then provides the user to assign the scrobble to.

vrobbler/settings.py

@@ -160,8 +160,8 @@ AUTHENTICATION_BACKENDS = [
 REST_FRAMEWORK = {
     "DEFAULT_PERMISSION_CLASSES": ("rest_framework.permissions.AllowAny",),
     'DEFAULT_AUTHENTICATION_CLASSES': [
-        #'rest_framework.authentication.BasicAuthentication',
-        #'rest_framework.authentication.TokenAuthentication',
+        'rest_framework.authentication.BasicAuthentication',
+        'rest_framework.authentication.TokenAuthentication',
         'rest_framework.authentication.SessionAuthentication',
     ],
     "DEFAULT_PAGINATION_CLASS": "rest_framework.pagination.PageNumberPagination",