TAJO-868: TestDateTimeFunctions unit test is occasionally failed.

Closes #34
TAJO-844: JDBC should be support getTime, getDate, and getTimestamp. (Hyoungjun Kim via hyunsik)

Closes #19
Closes #24
TAJO-859: Update site for new committer Alvin Henrick. (hyunsik)

Closes #27
TAJO-840: Improve query result print with counting empty table. (jaehwa)
TAJO-839: If all tables participate in the BROADCAST JOIN, there is some missing data. (Hyoungjun Kim via jihoon)
TAJO-861: tajo-dump script are not executable. (jinho)
TAJO-862: Restore failure of dumped relations. (jihoon)
TAJO-847: Supporting MariaDB-based Store, which is compatible with MySQL. (Jinhang Choi via jihoon)
 TAJO-880: NULL in CASE clause occurs Exception. (Hyoungjun Kim via hyunsik)

 Closes #40
TAJO-848: PreLogicalPlanVerifier::visitInsert need to find smaller expressions than target columns for a partitioned table. (jaehwa)
TAJO-879: Some data is missing in the case of BROADCAST JOIN and multi-column partition. (Hyoungjun Kim via jaehwa)
TAJO-850: OUTER JOIN does not properly handle a NULL. (Hyoungjun Kim via hyunsik)

Closes #22
TAJO-853: Refactoring FilterPushDown for OUTER JOIN. (Hyoungjun Kim via hyunsik)

Closes #28
TAJO-886: Add IRC page to community section in site.

Closes #45
TAJO-882: CLI hangs when a error occurs in the GlobalPlanner. (Hyoungjun Kim via hyunsik)

Closes #42
TAJO-887: Eliminate HiveQL support feature.

Closes #46
TAJO-887: Eliminate HiveQL support feature. (missed elimination of hiveql config).
TAJO-890: Redirect stdout of maven test to /dev/null in Travis CI script.

Closes #47
TAJO-866: COUNT DISTINCT with other aggregation function throws ClassCastException. (Hyoungjun Kim via hyunsik)

Closes #36