Confirm completion of Ex 12, EC 1 of LRTHW.

Write an all-comment Ruby script to complete Exercise 12, Extra
Credit 1 of Learn Ruby the Hard Way, explaining the differences
among require, include, load, and extends.
Add Ex 12, EC 2 of LRTHW.

Add script completing Exercise 12, Extra Credit 2 of Learn Ruby the
Hard Way. Show that yes, you can require a script that doesn't
contain a library specifically. Demonstrates the Ruby module
load path ($:, or $LOAD_PATH) and the unshift member function on
arrays.