Feature Request: Navigator stack reset to <X> view

I think an important navigation feature would be to reset the root navigation (this pattern is useful for apps that have a login screens, or an hamburger alike menu), in theory this could make issue #36 much more manageable (or defer the native drawer support to later).

No files, tests, or entry points are named. Start by reviewing the existing navigator API and issue #36 to define the intended reset-to-view behavior. Done means the navigation stack can reset its root to a specified view and the behavior is covered by tests.

Written by the indexing model from the issue text.