Return typed lists in find() method whenever a list generator method is registered with objectory

This way, lists returned by find() have the correct generic type and can be passed with security across typed code when run in checked mode.
Merge branch 'master' of https://github.com/vadimtsushko/objectory into find_typed_list

Conflicts:
	example/domain_model.dart
	lib/src/objectory_base.dart
	lib/src/objectory_direct_connection_impl.dart
	lib/src/objectory_websocket_browser_impl.dart
	lib/src/objectory_websocket_vm_impl.dart
Remote typed list in find() test inside the example
Merge pull request #41 from izaera/find_typed_list

Support typed Lists in find