Started linking send data with the bytearray.
Merge pull request #4 from pgaref/ra-dev

Added additional analysis of Driver Program. In particular, read input (source) annotations to understand where the data comes from. Also added a schema annotation to indicate the format of the data.
Fixed error...
Added basic network source and console sink, added more info in BaseTest to serve as an example. Included convenient methods in ITuple to print all fields
Checkpointing while context switching
Basic worker-worker tuple communication. Gonna need to implement more advanced transmission mechanism to do batching properly...
checkpoint...
First draft of worker-worker communication. Fixed some concurrency issues in the NIO handler