Add read/writeVertices for kryo.
Methods for read/writeGraph in kryo seem happy-ish.
New serialization for kryo works in toy graph.
Get read/writeEdge in GraphSON working.
read/writeVertex for GraphSON is working.
read/writeVertices for graphson is working.
IO Tests pass for graphson write/readGraph.
Regen'd all files - dropped refactoring infrastructure for write/readGraph