Created wall class + misc

Create an unpassable location type and added a hacky board thing for
testing.
	modified:   src/Board.java
	modified:   src/Main.java
Merge branch 'master' of https://github.com/Ciaran5933/clue

Conflicts:
	src/Board.java

	modified:   src/Board.java
	modified:   src/Main.java
	modified:   src/SwimmingPool.java