refactoring

using different function for creating properties
added helper methods for enums

new helper methods allow converting Enums of Individuals to Resources
code refactoring
need model constructed on owner side, stored in full on node side

added new hardcoded dummy data on owner side
model without nodeURI is created on owner side and sent to node
that model is then reassembled around a new NEED node that has a needURI
NeedModelMapper is not used, everything is done in LinkedDataServiceImpl