Simplified demo, bound the interface to a property, dixed the scrollview class.

Instead of old-fashioned bindings..  Just update the "layoutType"
property through bindings with the segmented control.  Also added
simple animations bewteen views.  No need to store our current view..
just outlet the content view and keep an array of the view
controllers...  Means faster loading of the subviews.,. and you dont
lose your place each time you switch..  Combined some declarations..
could definitely keep going...  IMHO, less words make things easier to
comprehend, deal with etc.  Deleted unnesceary files..  main.m,
credits, appdelegate etc.