1) Create DirectClientQuerySegmentWalker to make it a bit easier to embed and use DirectDruidClient as a client.
Merge branch 'master' of github.com:metamx/druid
1) Introduce idea of value types and generic columns to the serialization format
2) Create SegmentLoader interface for the loading of segments!
3) Setup serialization of new format and conversion function inside IndexIO
4) Make some adjustments to the twitter demo to make it make a bit more sense based on some email feedback from someone kicking the tires.