Merge branch 'devel'

Conflicts:
	pom.xml
	src/main/java/at/ac/univie/mminf/qskos4j/issues/relations/UnidirectionallyRelatedConcepts.java
	src/main/java/at/ac/univie/mminf/qskos4j/issues/relations/ValuelessAssociativeRelations.java
Merge branch 'devel'

Conflicts:
	pom.xml
	src/main/java/at/ac/univie/mminf/qskos4j/issues/relations/UnidirectionallyRelatedConcepts.java
	src/main/java/at/ac/univie/mminf/qskos4j/issues/relations/ValuelessAssociativeRelations.java
Merge branch 'devel'

Conflicts:
	pom.xml
	src/main/java/at/ac/univie/mminf/qskos4j/issues/relations/UnidirectionallyRelatedConcepts.java
	src/main/java/at/ac/univie/mminf/qskos4j/issues/relations/ValuelessAssociativeRelations.java
addition of 2 new issues
added empty labels check
started implementation of common language test
started implementation of common language test
common language issue complete and tests pass
report output improvements
Merge branch 'devel'

Conflicts:
	pom.xml
	src/main/java/at/ac/univie/mminf/qskos4j/issues/relations/SolelyTransitivelyRelatedConcepts.java
	src/main/java/at/ac/univie/mminf/qskos4j/issues/relations/UnidirectionallyRelatedConcepts.java
	src/main/java/at/ac/univie/mminf/qskos4j/issues/relations/UnidirectionallyRelatedConceptsReport.java
	src/main/java/at/ac/univie/mminf/qskos4j/issues/relations/ValuelessAssociativeRelations.java
	src/main/java/at/ac/univie/mminf/qskos4j/issues/skosintegrity/MappingClashes.java
	src/main/java/at/ac/univie/mminf/qskos4j/issues/skosintegrity/RelationClashes.java
	src/main/java/at/ac/univie/mminf/qskos4j/util/Tuple.java
	src/main/java/at/ac/univie/mminf/qskos4j/util/TupleQueryResultUtil.java
	src/test/java/at/ac/univie/mminf/qskos4j/issues/UnidirectionallyRelatedConceptsTest.java
	src/test/java/at/ac/univie/mminf/qskos4j/issues/ValuelessAssociativeRelationsTest.java