TAJO-1006: Fix wrong storage unit for kilo bytes and others.

Closes #117
TAJO-985: Client API should be non-blocking. (jinho)
TAJO-1007: Update site for new committer and new contributors.

Closes #120
TAJO-992: Reduce number of hash shuffle output file.
Remove unused code in HashShuffleAppenderManager.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-992
TAJO-1009: A binary eval for column references of the same tables should not be recognized as a join condition.

Closes #121
TAJO-984: Improve the default data type handling in RowStoreUtil. (jihoon via hyunsik)
TAJO-1011: EvalTreeUtil::isJoinQual need to handle other join conditions. (jaehwa)
TAJO-704: TajoMaster HA (jaehwa)
TAJO-1008: Protocol buffer De/Serialization for EvalNode.
TAJO-1013: a complex equality condition including columns of the same table is recognized as a join condition.

Closes #123
Revert "TAJO-1008: Protocol buffer De/Serialization for EvalNode."

This reverts commit 49d52553c5e4ef37a6af4605befbe36b0dd36c3c.
TAJO-1008: Protocol buffer De/Serialization for EvalNode.
TAJO-992: Reduce number of hash shuffle output file.
Add some comments about Intermediate file's split.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-992

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