Adding parse_file to parse records in a file.
Adding tests for Person#to_s
Adding pry for debugging.
Starting to get sorting working for gender, last_name ascending.
Adding sorting by birth date.
Adding sorting by last_name.

This page showed reversing the normal sorted output would be fine runtime-wise:
http://stackoverflow.com/questions/2642182/sorting-an-array-in-descending-order-in-ruby