Fixed typo: DataSourceRouteActionResolve not ..ROOTActionResolver
Fix data source root resource view.
Added test for getting of root resource.
Refactored QueryableActionResult and QueryProjection parts, and added a few tests for QueryProjection.
An child collection property of a non-existant parent resource now causes 404 not found, instead of returning empty collection.
Bumped version to 0.12.2