TAJO-953: RawFile should release a DirectBuffer immediately. (jinho)

Closes #79
Fixed wrong table syntax in sphinx doc.
 TAJO-956: CONCAT should be support multiple params and null param. (Hyoungjun Kim via hyunsik)

 Closes #81
TAJO-960: TajoCli's problem does not show the current status.

Closes #83
TAJO-955: Add database selection submit button in catalogview.jsp for text based browse. (Hyoungjun Kim via jihoon)
TAJO-961: TajoCli should exit when at least one query faces error while executing a SQL script. (hyunsik)

Closes #84
TAJO-965: Upgrade Bytes class and move some methods to others.

Closes #86
TAJO-939: Refactoring the column resolver in LogicalPlan.

Closes #71
TAJO-666: java.nio.BufferOverflowException occurs when the query includes an order by clause on a TEXT column. (Mai Hai Thanh via jihoon)
TAJO-972: Broadcast join with left outer join returns duplicated rows.(Hyoungjun Kim via jaehwa)

Closes #89
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-914

Conflicts:
	tajo-core/src/test/java/org/apache/tajo/engine/query/TestCaseByCases.java