Do some gui changes
Merge branch 'master' of https://github.com/MathIsFun/SlopeModel

Conflicts:
n/agent/Agent$direction.class
	bin/agent/Agent.class
	bin/agent/Skiier.class
	bin/main/Main.class
	bin/slope/Slope.class
	bin/slope/SlopeCell.class
	slope/Slope.java
	src/agent/Agent.java
	src/agent/Skiier.java
	src/main/Main.java
	src/slope/SlopeCell.java
do some gui changes