Fix level_type.
Merge pull request #518 from code-dot-org/fix-level-builder

Fix level_type.
Migrate data from maze column to properties column since it is no longer being stored as a string.
Fix migration
Set maze column explicitly to nil.
Merge pull request #519 from code-dot-org/migrate-old-maze-data

Migrate data from maze column to properties column since it is no longer...
Automatically built.
Temporarily comment out banner about locale not being supported.
Merge branch 'finished' of github.com:code-dot-org/dashboard into finished
add type column.
Start refactoring
Fix storng params.
Use iterated params for artist levels.
Add tests to make sure STI is working.
more tests to make sure STI is working.
Refactoring.
Add html and logic for karel builder.
Add test for maze/karel distinction in maze builder.