TAJO-1040: Misuse netty HashedWheelTimer. (jinho)
TAJO-1048: Missed use of session variables in GlobalPlanner.

Closes #146
TAJO-948: 'INSERT INTO' statement to non existence table casuses NPE. (Jongyoung Park via hyunsik)

Closes #142
TAJO-1054: Wrong comment in ByteUtils.splitWorker(). (Jongyoung Park via jinho)
TAJO-1046: Remove hadoop native dependency of pullserver. (jinho)

Closes #143
TAJO-1016: Refactor worker rpc information. (jinho)

Closes #125
TAJO-1050: RPC client does not retry during connecting. (Jihun Kang via jinho)
TAJO-1056: Wrong resource release or wrong task scheduling. (jinho)

Closes #151
TAJO-1047: DefaultTaskScheduler:allocateRackTask is failed occasionally on JDK 1.7. (jinho)

Closes #144
TAJO-1049: Remove the parallel degree limit up to the maximum cluster capacity.

Closes #147
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into EliminateDatum

Conflicts:
	tajo-core/src/main/java/org/apache/tajo/worker/Task.java