Merge pull request #7 from coxry/master

Code cleanup via maximum awesome
Added sound for jumping. Woohoo.

Only using ogg support to limit number of files and file size.
Removing some debugging bits.

Also added credit from README.md to LICENSE.md.
Added an About text.

Didn't want to throw away the menu, so threw up some about stuff to
justify.
Tried a new map to ensure loading works properly.

Also modified jump mod to work better with the map.