NSStoryboard additional work...

[gcasa]

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1. A couple of observations so that you know I am actively thinking of code quality and structure: NSStoryboardSegue might need to be broken up into subclasses differentiating on the "perform" function based on the variable "kind" (i.e. show, modal, etc would have a different subclass with the current implementation for each in it). The pattern here is pretty obviously pointing towards that kind of thing. Also, I intend to look further into the idea of making the segue just a connection, though I do see some roadblocks there.
2. Note the "showSeguePresentationStyle" entry. I need to take this into account. Since this branch is specific to getting these controllers implemented I will also do this in a separate PR right after this one. This property, apparently, controls whether or not the controller can be shown multiple times or just once. I am going to start that branch now. It will be NSStoryboard_updates.