Replace the isSingleton bool with a RegistrationFactory lambda, which should more easily allow other scopes
Add OnStart hook for when Stylet starts up, and rename the existing hooks to avoid confusion
Remove all instances of 'throw new Exception'
Avoid invalid binding notice when showing a MessageBox with the default title
Prevent double closure of a Screen
Ensure that we don't throw if actions are bound before the ActionTarget is assigned
Simplify IViewManager, by aligning it to what someone actually wants the ViewManager to do
ActionExtension.NullTarget and .ActionNotFound are no longer nullable, leading to clearer XAML
Correct unintentional change to StyletIntegrationTests/ShellView.xaml
Add LogManager, and logging
Bring unit test code coverage back to par