AutoLayout
==========

Version 1.1  31 Jan 2016    Custom Asset catalog for size classes.
Version 1.0  15 Jan 2016    Initial Version

Example of how to use center constraints to proportionally
space views along horizontal or vertical axis.

Solution is implemented with Interface Builder, in code and
with a stack view.

See this post for further details:

http://useyourloaf.com/blog/proportional-spacing-with-auto-layout.html