* changed assumed location of the model repository class file in cord-m
* added one retry attempt in case of error to the API GET method to compensate ugliness of the backend work
* added support for defining predefined collections in the model repository. This is useful for example when model has small number of instances and only full collection with all fields is used.
Future improvements:
* added convenient static constructors for the popular cases: Future.single(), Future.resolved() and Future.rejected()
* added ability to lock future from the further calls of fork() (that is need by Future.single())