TEZ-832. Fix a race in MemoryDistributor. (sseth)
TEZ-596. Change MRHelpers.serializeConf* methods to use Protobuf for
serialization. Contributed by Mohammad Kamrul Islam
TEZ-637. [MR Support] Add all required info into JobConf for MR related I/O/P (bikas)
TEZ-815. Split initialize and start implementations for the various
Inputs and Outputs. (sseth)