Remove trailing whitespace from the Python
Fix whitespace for async test detection

Presumably since Python is whitespace-sensitive, this is actually quite important?
Merge pull request #123 from domenic/whitespace-fixes

Whitespace fixes
add "assert.js" to python, website runners too
Merge pull request #124 from domenic/asserts

Initial assert helpers
Merge pull request #127 from smikes/asserts

add "assert.js" to python, website runners too
Add assert.throws

Closes #57.
Add an example of using assert.throws