The watch attribute doesn't work for complex objects

[jdmarsh]

When using a complex object inside the watch attribute, changes don't get tracked. Suggest finding a suitable case where the third objectEquality argument should be set for $scope.$watch('rows',....

[alalonde]

Seems like a reasonable configuration. Could you put together a PR with an additional @watchOptions input with values shallow, collection, and deep ? Would that suffice?