rebase from apache
TAJO-554: LogicalPlanner should allow additional expressions with asterisk in select list. (jihoon)
TAJO-598: Refactoring Tajo RPC. (jinho)
fix netty conflicts
TAJO-305: Implement killQuery feature. (hyunsik)
TAJO-595: The same expressions without different alias are not allowed. (hyunsik)
TAJO-606: Statemachine visualization fails. (Min Zhou via hyunsik)
TAJO-530: Fix warnings in tajo-catalog. (jaehwa)
Fixed a typo in mailing list page.
TAJO-609: PlannerUtil::getRelationLineage ignores PartitionedTableScanNode.(hyunsik)
TAJO-601: Improve distinct aggregation query processing.(hyunsik)
Fixed constant bugs of join queries.
TAJO-575: Worker's env.jsp has wrong URL which go to worker's index.jsp. (hyoungjunkim via jaehwa)
TAJO-578: Update configuration for tajo-site.xml. (jaehwa)
TAJO-610: Refactor Column class.
TAJO-614: Explaning a logical node should use ExplainLogicalPlanVisitor.
TAJO-590: Rename HiveConverter to HiveQLAnalyzer. (jaehwa)
TAJO-622: Add TM mark and navigation links required for TLP project.
TAJO-622: Add TM mark and navigation links required for TLP project. (improved TM symbol)
TAJO-594: MySQL store doesn't work. (Yongjun Park via jaehwa)