Match column on cases table shows whether test succeeded or failed with green checkmark or red X.
If a test case raises an error, show it in test cases output as red.
New home page has grid of lessons x exercise types.
Added level-picker to top-right and skip/continue button to bottom-right.
Use icons for characters instead of unicode symbols, for precise positioning.  Also put blue column before red.
Rename gold to yellow.
Pie chart icons in upper-right to pick level, instead of drop down.
Redo curriculum to have five colors, four levels.
Add Twitter feed to home page.
Bug fix: I broke support for syntax errors earlier
Added more descriptive end-of-the-road button.
Don't ignore any newlines in output.
Oops, left in debug message.
Oops, forgot test case for 1.4G
Added 'demo of advanced debugger features'
Bug fix: level indicators didn't show on production.
Still trying to fix images on production.