Pixel align puzzle select header label
Rename OPMenuViewController to OPMainViewController

This main view controller will be used to animate around
the menu, parallax landscape, and game view controllers.
So a more appropriate name is OPMainViewController
Add Pop as submodule and project dependency

Add -ObjC and -lc++ linker flags
Use Pop for parallax animation

Utilize a gesture recognizer and pop animations
to perform the parallax animation of the menu
background landscape.
Fade away menu select with a gesture

Instead of animating away the puzzle menu over
a duration, animate it away as the user pans left.