add beer-song example
add nucleotide-count assignment
add recent assignments to curriculum

forgot beer-song and nucloetide-count earlier
add point-mutations exercise
add phone-number assignment
add grade-school assignment
add robot-name assignment
standardize Python exercise error messages
add etl assignment
add leap year example

this leaves out the monkeypatching bit since it's super ugly/hacky/bad
in Python.
js/roman-numerals exports
add use strict to js/binary example
change name of the exercise file to require
add js/prime-factors
add js/raindrops
js/allergies module.exports
js/strain module.exports
add js/atbash-cipher
js/accumulate rename exercise file
js/crypto-square module.exports