Merge pull request #58 from hAdamm/as-development

Extended interface IEntitiesCollection by getSpecification
extend anotation dataType
Merge pull request #59 from Hlavos/rh-annotation

Extend anotation dataType
Fixed double invoking event
Merge pull request #60 from ZZromanZZ/bugFix

Fixed double invoking event
Added feature of counting the collection items without loading the content