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Allow subclasses of Dragging Coordinator to override the default nav controller that gets created
This branch does:
- allow users to override the creation of the UINavigationController so they can provide custom subclasses
- changes the z index ordering of the views to be: backgroundView (lowest) to draggable view to presented view controller (highest)
- can now dismiss the presented view controller by dragging the avatar away from the conversation area. This is optional behaviour