assignment due 8/4, 1NN. Comments are in the file.

Hi @sinanuozdemir and @kperezlopez! I was taking a quick look through here and it wasn't clear to me where the data is loaded, or what the data should be precisely. I see the URL on line 20, but there are many files there. What data is being used, and how is it being loaded? Am I missing something? It seems that we need to know those things before we can know whether factors are being passed to `distance`. Yes?