ENHANCEMENT:added inline comments to Simple CSS to help new users when they are completing the tutorial. Added a couple of style fixes for the search form and navigation.
MINOR:added css/.DS_Store to the gitignore file
ENHANCEMENT: added basic grid system to Simple Theme. 
MINOR:accidentally committed loop $parent that I didn't intend to, changed back to loop $level(1)
MINOR:added the classes back in that I accidentally deleted.
Merge pull request #20 from jbridson/master

ENHANCEMENT:added inline comments to Simple CSS to help new users when they are completing the tutorial. Added a couple of style fixes for the search form and navigation.