Added CITI relationship properties; create mock object nodes.
Added methods to discover nodes by properties in triplestore.
Added rdfs:label to list of properties for Resource.
Initial generalization of property gathering methods.
Re-using prop build and update node methods in POST
Moved authorization to init method.
Split up POST and PUT method into smaller methods; normalized some member names.
Fixed typo.
Using self.uid.
Modified workflow for instances; normalized method names.