Test for case-insensitivity and give hints

[martinheidegger]

I got reminded in nodeschool/discussions#700 that sometimes the problem occurs that people don't see the difference in their output. uppercase/lowercase etc. It might be good to check something like:

function normalise(string) {
   return string.replace(/\.|\!|\?|\s|/g, "").toLowerCase()
}

function isProbablyTypo(expectedAnswer, answer) {
   return normalise(expectedAnswer) === normalise(answer)
}

if (isProbablyTypo(expectedAnswer, answer)) {
   console.log("Looks like you did the right thing but maybe you had a typo in there. We are a little picky to make sure that you understood the question. Maybe you want to check for typos?")
}

[SomeoneWeird]

Now that we have diff'ing in the latest javascripting, this shouldn't be much of an issue anymore. Going to close for now.