TAJO-1232: Implicit groupby queries with LIMIT lead to wrong results. (jihoon)
TAJO-1247: Store type 'TEXTFILE' should be TEXT while keeping enum 'TEXTFILE' in protobuf. (DaeMyung Kang via hyunsik)

Closes #302
TAJO-1259: A title in catalog configuration document is different from others. (Jongyoung Park via hyunsik)

Closes #310
Merge branch 'master' into TAJO-920
TAJO-920: Add FIRST_VALUE and LAST_VALUE window functions