Added initialize() call in vertexEdges.
Added initialize() call in vertexEdges.

Seems that I forgot to put initialize in all the needed places. VertexEdges may
be the first call into the graph if the user created a vertex object directly
without calling "vertices".

ellitron/ramcloud-gremlin,jdellithorpe/torc-gremlin,ellitron/ramcloud-gremlin,jdellithorpe/torc-gremlin