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)
Merge branch 'master' of git://github.com/apache/incubator-tajo into outerjoin_1
Re-synchronize to original TAJO 27 August