Merge pull request #5 from ougrimley/design

changes to css, new images for icons and background. some minor file mod
for rebasing, just a gem move
Add in Chris's email changes to let the Featured topic areas float, and change the color of the scrollspy highlight/subject title bg/indicator title bg. Also, change the color of the yellow Land Use issue area icon so that it's visible (at least on Mac Retina screens)
remove <br> tags inside issue area icons
not much other than the jumbotron
trying one more time