TAJO-673: Assign proper number of tasks when inserting into partitioned table. (jaehwa)
TAJO-936: TestStorages::testSplitable is failed occasionally. (jinho)
TAJO-904: ORDER BY Null first support. (Hyoungjun Kim via hyunsik)

Closes #70
TAJO-933: Fork some classes of Parquet as builtin third-party classes.

Closes #75
TAJO-20: INSERT INTO ... SELECT. (Hyoungjun Kim via hyunsik)

Closes #72
TAJO-945: Connecting to Tajo by JDBC driver failed with SQL Exception "Invalid JDBC URI". (Mai Hai Thanh via jihoon)
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-939
Changed resolving level to RELS_ONLY in some operator.
Merge branch 'TAJO-939' of github.com:hyunsik/tajo into TAJO-939

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