Create a filterCallback() method on generic ListObject
Create a PDORequest object, start #3
Bug fix on ArrayObject setter() chaining
Fix Remove old PDORequest code
Separate FileProvider aspects to KeyValueProvider ones
Uniform namespaces & coding standard
Add ordering field to the generic provider API, close #28
Bugfixes on model initiation when a schema is set
Allow to connect a Query with a PDOProvider, close #3