Added auxiliary method to return the opposite direction of a parameter one.
Cleaned up documentation and useless lines.
Created and partially tested the World class, which contains locations and characters in the world.  You can register Locations, which must be unique.  You can also connect Locations, which creates two way paths.
Added hashCode/equals methods
Moved things around in the WorldTest.java, and fixed formatting issues in World.java
Moved methods around for consistency, and changed the output of the toString method.