added won:hasTag in the ontology
Merge branch 'feature-add_hasTag'
check for fieldnames
Some refactoring has been done and two filters have been implemented
Merge branch 'title_desc_matching' into feature-metadata

Conflicts:
	webofneeds/won-matcher-solr/src/main/java/won/matcher/query/TextDescriptionMatcher.java
Some refactoring has been done and two filters have been implemented