Remove obsolete collections/entities code
Change addAggregate API to expect a definition instead of a class
Rename CommandService to AggregateService
Remove obsolete MixinSetGet
Rename MixinEvents to HelperEvents, Switch to JS (original)
Rename (Read)AggregateRoot to Aggregate
Refactor towards new Aggregate structure
Move AggregateEntity behaviour into the Aggregate so the Root and Entities are completely vanilla