Add a test to verify change tracking applies to AddRange'd items
Prevent multiple evaluation of the IEnumerable in ReactiveList.AddRange. Fixes #392.
Merge pull request #393 from reactiveui/change-tracking-addrange

Prevent multiple evaluation of the IEnumerable in ReactiveList.AddRange
Fix to ObservableAsyncMRUCache where a call to a release function could block if the key in the cache was evicted while still in flight.
Use subscribe instead of await