small changes apps, data explorer, and account feed items and replaced background images
small change to data classifications page
updated background images
fixed some spacing on general about page
Merged Stephanie's last changes with Dave's site changes

Conflicts:
	visual/html/apps/home.html
	visual/html/data/classifications.html
	visual/static/css/visual.css
	visual/static/img/backgrounds/hill_background.png
	visual/static/img/backgrounds/lab_background_blur.png
	visual/static/img/bgs/hills.png
	visual/static/img/bgs/road.png