Create a "ShadowView" UIView container

[tylermilner]

Creating views that have a shadow and a rounded corner can be tricky. I believe you have to create a rounded shadow as a parent view and then add the content view as a subview and round its corners (exact method needs verification). It would be nice to have a reusable and configurable "ShadowView" that sets up this hierarchy properly that we could reuse between projects.