Updating to latest stable core
SagaPersister now throws for stale reads

Unless the users has explicitly opted-in

Added opt-in
Adjusting acceptance test to set unique

And a few other fixes to get the tests more stable

Better tracing

Shoretening test name

Using separate appdomain

To figure out why the test is flaky

Separated saga test endpoints

Removed using
Merge branch 'safe-saga-loads' into release-2.0.0