TAJO-772: TajoDump cannot dump upper/lower mixed case database names.
TAJO-741: GreedyHeuristicJoinOrderAlgorithm removes some join pairs. (jaehwa)
TAJO-752: Escalate sub modules in tajo-core into the top-level modules. (hyunsik)
TAJO-763: Out of range problem in utc_usec_to(). (Ilhyun Suh via hyunsik)
TAJO-777: Partition column in function parameter occurs NPE. (Hyoungjun Kim via hyunsik)
TAJO-748: Shuffle output numbers of join may be inconsistent. (jaehwa)
TAJO-675: maximum frame size of frameDecoder should be increased. (jinho)
TAJO-737: Change version message when daemon starts up. (hyunsik)
TAJO-652: logical planner cannot handle alias on partition columns. (Hyoungjun Kim via hyunsik)
TAJO-786: TajoDataMetaDatabase::getSchemas creates invalid MetaDataTuple.
TAJO-787: FilterPushDownRule::visitSubQuery does not consider aliased columns. (jaehwa)
TAJO-788: Update Tajo documentation and README, and BUILDING. (hyunsik)
Merge branch 'branch-0.8.0' of https://git-wip-us.apache.org/repos/asf/tajo

Conflicts:
	BUILDING
	README.md
	tajo-core/src/main/java/org/apache/tajo/master/TajoMaster.java
	tajo-core/src/main/java/org/apache/tajo/worker/TajoWorker.java
Fixed some imports.