Changed checking on plural form of a noun to class.
Added support for attributes if a String exists in a sentence.
Changed the type of an attribute to Java class types.
Added an association-to-attribute function to the TreeController.
Merge branch 'master' of https://github.com/ArjanO/AP-NLP

Conflicts:
	src/main/java/nl/han/ica/ap/nlp/controller/TreeController.java