added in thumbnail previews
semicolons of course
adding an equal sign
Merge pull request #316 from mozilla/thumbs

Thumbs
log and channel cleanup
Merge pull request #317 from mozilla/channels

log and channel cleanup
Merge branch 'master' of https://github.com/mozilla/appmaker into appmaster
Updated markup and styles for:
- level intro
- level status
- level finished
overlays.