Added automatic meme guessing, via damlev

New feature, automatic meme guessing. Now, when someone attempts to make a meme and typos the string, we do a distance calculation, and return the most appropriate result.

`!meme m:feel i know that;feel bro` should return a feels meme. Previously it would return an error message.

`!meme m:dakjsfadsfjka meme;meme` shouldn't return anything

Eventually I'll write some tests, but in the mean time no…