Updated endings, cleaning up, adding license

Moved textAdventureA-specific classes out into the items and locations
files. This, in turn, allowed me to set up items to be able to removed
themselves from locations.

Updated the end-game with strings custom-written based on what the user
did in the game.

Adding the GNU License header.
Version 1.0

Updated the readme.txt with the done-ness of the game. Added a "Press
enter to close" at the end of the endstate so users don't have to run it
in an IDE to see the last screen.