Add syntax highlighting for code.
Start explanation of expression problem.
Increase indent of Java code.
Tweak color of types.
Tighter formatting of Java code.
Fix selectors, use less nesting syntax.
Add styling for code blocks with line numbers.
Make line numbers less visually noisy.
Add extensions.
Add styling for bad code blocks.
Flesh out Java half, goals, outline, more.
Flesh out Haskell case.
Add section on expression problem.
Add section on workarounds.
Add link back to course web page.
Add link to expr problem intro, update schedule.