extraneous non-semantic markup

wrapping featured content with an extra div.  You can't add
padding/border to span3 or else it pushes content down.  This helps us
move away from fluid (being removed in V3) and prepares us for the new
grid system.  V3 will use percentage grid system instead of pixel
based, so perhaps we can remove this extra div down the line.
Adding notes to code.  Cleaning up indentations