TAJO-433: Improve integration with Hive. (jaehwa)
TAJO-484: Fix bug [: !=: unary operator expected when execute start-tajo.sh. (DaeMyung Kang via jihoon)
TAJO-474: Add query admin utility. (DaeMyung Kang via hyunsik)
TAJO-438: Date literal support. (Jae Young Lee via jihoon)
TAJO-483: Add getParentCount(), getParents(), getParent() functions to DirectedGraph. (jihoon)
TAJO-477: Rename killQuery of QMClientProtocol to closeQuery.
Fixed union.
Fixed lots of bugs and refactoring.
Works all groupby.
TAJO-490: Tajo can't use 'dfs.nameservices' based on namenode ha mode.
TAJO-490: Tajo can't use 'dfs.nameservices' based on namenode ha mode. (Added a missed changelog)
Fixed simpleEval.
Fixed some unit tests.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-tajo into LogicalPlanRefactor

Conflicts:
	tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/AlgebraVisitor.java
	tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/engine/planner/LogicalPlanner.java