Added new remove method which takes in a Object inside of a DListNode. Added for generality
Minor Change
Added parentVertex class. parentVertex keeps track of which Vertex's edgeList contains the Half-Edge. This was added so that during getNeighbor, the HalfEdges would have access to their parent vertices.
Removed redundent isMember checking
Changed addEdge so that when a self-edge is created, two half-edges are not created under the same edge. Also, made Vertex Iterable
Made major changes. WARNING: this WUGraph implemenation has problems as highlighted under WUGTest.java. This is not the final version.
Merge branch 'master' of https://github.com/qjhe96/pj3