Added a metadataQuery property
Store an optional metadata query in the query object
Added a method that prepares and validates the metadata query before it's sent to the adapters
Added a field for normalized metadata that will be used for searching
Added some tests for the metadata query. Skips the tests for the Doctrine adapter for now
Updated ChangeLog
Added docs about the new rules regarding metadata keys
Validate metadata keys. Tests have also been added
Added some unversioned files. WIP
Fixed values in the data provider
Added a setter and getter for the metadata query parser
First (seemingly) working copy of the metadata query parser. Not yet feature complete
Changed namespace
Updated dependencies