Many Changes From Tom

So, there were many changes here.

1)  Many of the sites URL's were updated.
2)  Added  Board Game University
3)  Added Dice Tower Showdown

To do this, I added two pictures to the images folder, updated the
index.php file with the additions and URL changes and then added to the
styles.css file to reflect the new additions.
Merge pull request #42 from dicetower/Rob-TomFixes

Many Changes From Tom