Update images on electricity
New illustration for wired-house.png
Add tagline
First pass at Igneous rock
build assets
fix routing
Added Metamorphic rock lesson
Updated igneous rock to use illustration helper
Updated weather/atmosphere to use illustration helper
built assets
Add middot between Lessons/Authors
build assets
Upgrade to 3.2.11
change layout to span11
Update images on electricity
Convert electricity lesson to HAML
Clean up asset directory
Fix bootstrap overrides
Add .rvmrc
Update more electricity images