TAJO-768: Improve the log4j configuration. (hyoungjunkim via jinho)
TAJO-769: A minor improvements for HCatalogStore (Fengdong Yu via hyunsik)
TAJO-772: TajoDump cannot dump upper/lower mixed case database names.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into window_function

Conflicts:
	CHANGES.txt
TAJO-741: GreedyHeuristicJoinOrderAlgorithm removes some join pairs. (jaehwa)
TAJO-752: Escalate sub modules in tajo-core into the top-level modules. (hyunsik)
TAJO-752: Escalate sub modules in tajo-core into the top-level modules. (fixed packaging problem.)
Fixed tajo-dist/pom.xml.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into window_function