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
TAJO-969: Distributed sort on a large data set may result in incorrect results.

Closes #87
TAJO-914: join queries with constant values can cause schema mismatch in logical plan.

Closes #78
TAJO-968: Self-Join query (including partitioned table) doesn't run unexpectedly using auto broad cast join. (jaehwa)

Closes #88
TAJO-977: INSERT into a partitioned table as SELECT statement uses a wrong schema. (Hyoungjun Kim via hyunsik)

Closes #95
TAJO-974: Eliminate unexpected case condition in SubQuery. (Hyoungjun Kim via hyunsik)

Closes #974
TAJO-974: Eliminate unexpected case condition in SubQuery. (missed ticket close)

Closes #93
TAJO-952: Wrong default partition volume config. (Mai Hai Thanh via jihoon)
TAJO-980: execution page in Web UI broken.

Closes #97
TAJO-976: HashPartitioner doesn't make desired number of partitions infrequently. (Hyoungjun Kim via hyunsik)

Closes #94
TAJO-976: HashPartitioner doesn't make desired number of partitions infrequently. (Fixed a build failure due to 1.7 API)