Add test graphs
Add testcases and implement FileHandler
Merge branch 'master' of github.com:Slaan/GKA

Conflicts:
	bin/interface_model/NamedEdge.class
	graphs/graph1.gka
	graphs/graph2.gka
	graphs/graph3.gka
	graphs/graph4.gka
	graphs/graph5.gka
	graphs/graph6.gka
	graphs/graph7.gka
	graphs/graph8.gka
	src/interface_model/NamedEdge.java