[relationships] fixed disabling recursive in ManyHasMany
[mapper] added value converter interface for mapper implementations
[entity] removed methods from IPropertyInjection (interface BC break!)
[relationships] ManyHasMany refactored to use IPropertyStorableConverter
[entity] implements IPropertyStorableConverter
[model] fixed StaticModel missing repositories property
[mapper] removed useless DateTime conversion
[tests] added FileMapper test
[tests] moved repository persistance test
[repository] fixed infinite persisting