added SaveGraphVertexProgram (not complete). Fixed a vertex-local sideEffect issue with TraversalVertexProgram.
removed SaveGraphXXX for now. In a gist and will deal later. Going to make Pair<> better.
no more Pair for MapReduce. Uses new KeyValue class. This gives us much more control on the serialization of the object and its toString representation. For @dalaro.
Very close to having a nice OutputFormat toString() representation for MapReduce.
tweaks to the Hadoop IO Formats. Added a StringOutputFormat that is not tied to anything yet -- may be the way for @dalaro. However, we will also need a BinaryOutputFormat for Kryo graph dumping..... starts to get confusing......