Metadata is now available as an event argument
Updated test case and added missing covers annotations
Add metadata as an argument to the events
Added normalizing/denormalizing of metadata so that the Doctrine driver can handle deep arrays
Throw an exception if a metadata key contains the separator
Added a note in the docs regarding the usage of :: in metadata keys when using the Doctrine database adapter
Fixed error message
Use a different namespace for the metadata cache for all test runs
Merge pull request #227 from christeredvartsen/normalize-metadata

Normalize metadata in the Doctrine database adapter to support nested arrays