TAJO-786: TajoDataMetaDatabase::getSchemas creates invalid MetaDataTuple.
TAJO-783: Remove yarn-related code from tajo-core. (hyunsik)
TAJO-787: FilterPushDownRule::visitSubQuery does not consider aliased columns. (jaehwa)
TAJO-788: Update Tajo documentation and README, and BUILDING. (hyunsik)
TAJO-517: Publish Tajo jar to a public maven repository. (hyunsik)
TAJO-734: Arrange TajoCli output message. (hyoungjunkim via jihoon)
Changed version in master branch to 0.9.0-SNAPSHOT.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-774

Conflicts:
	CHANGES
Add clone() to all algebraic expr.