Beginning work on Autolayout of DisplayVC.

Using Autolayout to define constraints between labels, Calendar button, program description.  Program description height automatically adjusting to one line, when it should constrain to the content height.
More constraints added in Program Details
Favorite SongsTVC embedded in Favorites tab view.

First half of #19.  Need to have another TVC of favorite shows that is presented when switched using the SegmentedControl
Segmented Control names to Songs and Shows.  #19
Outlets for container view and segmented control.  #19
Beginning implementation of to switch container views.

#19 technique from stackoverflow.  Line 55 throws error because favShowsVC instatiated as nil.  Likely due to error programming with StoryboardID.
Strong property type added to container VCs.

#19 - this makes it so the favSongs and favShows VCs will not lose their values.
Breakpoints
User state
User state
Merge head