TAJO-47: RowFile has the duplicated initialization problem and unflipped ByteBuffer problem. (jihoon)
update doc to change Yarn home env from YARN_HOME to HADOOP_YARN_HOME.
TAJO-50: Cleanup SubQuery. (hyunsik)
TAJO-37: Remove obsolete classes WorkerEventDispatcher, WorkerEvent and WorkerEventType. (sunny.1324 via hyunsik)
TAJO-54: SubQuery::allocateContainers() may ask 0 containers. (hyunsik)
TAJO-57: Recognize Parser and Catalog Standard SQL data types. (hyunsik)
TAJO-57: Recognize Parser and Catalog Standard SQL data types. (adding missed files)
TAJO-58: Remove obsolete methods in GlobalPlanner. (hyunsik)
TAJO-48: BufferUnderflowException occurs during the initialization of RowFile. (jihoon)
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/incubator-tajo into NEW_OPTIMIZER

Conflicts:
	tajo-catalog/tajo-catalog-common/src/main/java/tajo/catalog/Column.java
	tajo-core/tajo-core-backend/src/main/java/tajo/master/GlobalPlanner.java
	tajo-core/tajo-core-backend/src/main/java/tajo/master/GlobalPlannerUtils.java
	tajo-core/tajo-core-backend/src/test/java/tajo/engine/parser/TestQueryAnalyzer.java
	tajo-core/tajo-core-backend/src/test/java/tajo/engine/plan/global/TestGlobalQueryPlanner.java
	tajo-core/tajo-core-backend/src/test/java/tajo/engine/planner/TestLogicalPlanner.java
	tajo-core/tajo-core-storage/src/main/java/tajo/storage/hcfile/HCFileMetaImpl.java
	tajo-core/tajo-core-storage/src/test/java/tajo/storage/TestStorages.java
Fixed some bugs caused by refactoring.