TAJO-123: Clean up the logical plan's json format. (hyunsik)
TAJO-130: Same queryConf file conflicts. (jinho)
TAJO-84: Task scheduling with considering disk load balance. (jinho)
TAJO-127: Implement Tajo Resource Manager. (hyoungjunkim via hyunsik)
TAJO-127: Implement Tajo Resource Manager. (Fixed some missing changes)
TAJO-136: Broadcast join should be enabled. (hyunsik)
TAJO-59: Implement Char Datum Type. (jihoon)
TAJO-137: Unreleased resources and wrong allocation requests in TajoWorkerResourceManager. (hyoungjunkim via hyunsik)
TAJO-141: Set on demand as the default cluster mode. (hyunsik)