add skip button.
rm test-unit cruft.
get something working with mocha and chai.
test and refactor whistle class.
bump dependencies.
don't concatenate and compress js in test environment.
fix difficultyHtml when there is no current step.
setup poltergeist debugging.
run unit tests on rake, also.
refactor board-difficulty relationship a bit.
handle variant creation at the data level.
cleanup routes a bit.
rebuild in spar.
set up production deployment target.
tweak multipliers.
get unit tests running.