TAJO-1252: PathValidator should allow hdfs paths which contain IP addresses. (jihoon)
TAJO-1221: HA TajoClient should not connect TajoMaster at the first. (jaehwa)

Closes #286
TAJO-1254: Fix getProgress race conditions in Query. (jinho)

Closes #304
TAJO-324: Rename the prefix 'QueryUnit' to Task.

Closes #306
TAJO-1232: Implicit groupby queries with LIMIT lead to wrong results. (jihoon)
TAJO-1247: Store type 'TEXTFILE' should be TEXT while keeping enum 'TEXTFILE' in protobuf. (DaeMyung Kang via hyunsik)

Closes #302
TAJO-1259: A title in catalog configuration document is different from others. (Jongyoung Park via hyunsik)

Closes #310
Merge branch 'index_support' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-838_3
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into index_support
Merge branch 'index_support' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-838_3

Conflicts:
	tajo-core/src/test/java/org/apache/tajo/engine/planner/physical/TestBSTIndexExec.java
	tajo-core/src/test/java/org/apache/tajo/engine/planner/physical/TestHashAntiJoinExec.java
	tajo-core/src/test/java/org/apache/tajo/engine/planner/physical/TestHashSemiJoinExec.java
Merge branch 'TAJO-838_3' of github.com:jihoonson/tajo-2 into TAJO-838_3