Use UIPageViewController to allow swiping between Top/Recent Stories #99
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Closing #92. This requirement introduced a situation that more than one StoryTableViewController will be on screen at the same time. Using delegate pattern in LoginViewControllerDelegate is not able to tell every VC instance to do proper operation when user login/logouts.
Therefore this has to include a refactor on how to deal with Login status changes, which will encapsulate in three classes, all inside
LoginService.swift
.LoginStateHandler is an observer and automatically fires when user login or logout.
LoginAction is a reusable class that automatically configures and presents our LoginViewController so we can remove all the duplicated segues which was everywhere in Storyboard
LogoutAction is also a reusable class to perform correct clean up operation.