20140320 - Minor revisions

The .backstretch artwork should scroll with the user so the entire
artwork can be seen. That is, .backstretch.top == window.top to
.backstretch.bottom == window.bottom.

* comic.html: Removed styles left over from initial testing
* luv.css: Substantial overhaul of responsive layouts, esp in footer
area.
*index.html: added 'column-1' to .strap.reveal and .strap.follow