Keywords!!

Disclaimer, my initial symbol for keywords was = (e.g: =key value) I don't want to change it to : unless @hylang/core settles on keywords as Clojure or as CommonLisp, as I like both I used a different symbol. Since @olasd and @rwtolbert didn't quite like =, I used robert's suggestion of ^ But it should be a community choice, most likely.

It might also lack tests, but at 2 a.m. my imagination also lacks, so suggestions are welcomed.