* Paging criterias added in BaseSpecification. New paginated specification added (CatalogFilterPaginatedSpecification) . EFRepository cleaned up and paging implementation added. Usage of the new paging infrastructure in CatalogService (Web and WebRazor).
* Use IReadOnlyList<T> instead of List<T> as return type from repositories.
* - Ordering possibility added in the specification.
- Evaluation of the specification placed in separate class.
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