TAJO-77: Rename TabletProto as FragmentProto in CatalogProtos.proto. (jihoon)
TAJO-81: Update the home page with Tajo logo. (hyunsik)
TAJO-79: Refactor and Improve TajoCli. (hyunsik)
Merge branch 'master' of https://github.com/apache/incubator-tajo into SQL_IMPROVE
Add LogicalPlanner2.