Add a new MainWindow NIB to experiment with.
Pin INAppStoreWindow.
Merge branch 'master' into hls

* master:
  Create a setter for the status item's title.
  Combine signals to simplify setting the status item's title.
  Continue the refactoring. All signals initialization under one function.
  Refactoring credential detection.
  Refactor Reachability.
  Add the concept of an AccountManager. (Will handle reachability, login, etc.)

Conflicts:
	Shiver.xcodeproj/project.pbxproj
This'll be Shiver 2.0.
Shiver is no longer an agent, per se. :)
Pin ReactiveViewModel.
Add some superclasses for the window/view controllers.
Implement view model loading in the new superclasses.
First view models and a new main window controller.
Adding what will be our stream view controller.
Add a view model for Streams, make the API wrapper return those.
Rename StreamView\* to StreamViewerView\*.
XIB additions; full of constraints.
Add a new readyAndReachable signal.
Don't need that.
Add an HLS URL to the stream's view model for great justice.
Simplify.
Private to public in the xib.
Rejigger the window and assorted controller setters.
Show streams!