Update TP3 bulk loader to use pre|postIteration
Merge branch 'titan09' of github.com:thinkaurelius/titan into titan09

Conflict concerned two changes:

* MessageType.Local.to is now called of

* Marko added a line to set metaproperties (properties of properties)
  in Titan's TP3 bulk loader vertex program, and this conflicted with
  my local changes around graph commits

Conflicts:
	titan-core/src/main/java/com/thinkaurelius/titan/graphdb/tinkerpop/computer/bulkloader/BulkLoaderVertexProgram.java