Issue #1465760 by JMTorres,jbrown: Storage stream wrapper should appear on any supported field regardless of entity type.

Invoke StorageContainerInterface::serviceSettingsDefault() to prepopulate the settings array so code can be cleaner.

Issue #1650988 by alanmackenzie,cam8001,jbrown: StorageRackspace class fails to pass correct $auth_host parameter for UK accounts.

Fix warnings and signed url encoding of filenames with spaces for S3 containers with access control.

Improve menu structure.
Remove _storage_classes_query().