#1: refactor utils to create nodes and edges
Merge remote-tracking branch 'origin/master'

Conflicts:
	sne-xacml-core/src/main/java/nl/uva/sne/midd/IDDFactory.java
	sne-xacml-core/src/main/java/nl/uva/sne/midd/builders/ConjunctiveBuilder.java
	sne-xacml-core/src/main/java/nl/uva/sne/midd/builders/DisjunctiveBuilder.java
	sne-xacml-core/src/main/java/nl/uva/sne/midd/builders/MIDDCombiner.java
	sne-xacml-core/src/main/java/nl/uva/sne/midd/interval/EndPoint.java
	sne-xacml-core/src/main/java/nl/uva/sne/midd/nodes/InternalNode.java
	sne-xacml-core/src/main/java/nl/uva/sne/midd/util/MIDDUtils.java
	sne-xacml-core/src/main/java/nl/uva/sne/xacml/policy/parsers/PolicySetParser.java