Implements feature: peek title

This new feature is designed to work with the “Featured Images”. It
will show an overlay with just the title of the post. Its best suited
to work in conjunction with the Tile Transparency and Slide Up
Animation features.

Important notes:
- This feature requires jQuery to be turned on.
- This feature does not play nice with Responsive Tiles.
- This feature only works with animation type “Slide Up” or with a
“Static Overlay”.