model.Models: added. this file contains two case classed called Node and NodeList, these classes are data structures for keeping node's information like their name, value and the weight of the relation
Messages: modified to use NodeList in it's signature
RelationFinderActor: modified to add weight to Node class using WordNet API. relatedConcepts() method modified to avoid null and now uses Option[T]
StoreToDBActor: modified to use NodeList's as a data structure for storing concepts to the Neo4j