TAJO-1078: Update contributor list.

Closes #165
TAJO-1074: Query calculates wrong progress before subquery init. (jinho)

Closes #162
TAJO-962: Column reference used in LIMIT clause incurs NPE.

Closes #164
TAJO-981: Help command (\?) in tsql takes too long time. (YeonSu Han via jaehwa)

Closes #174
TAJO-1068: Add SQL Query documentation.

Closes #155
TAJO-1077: Add Derby configuration documentation.

Closes #163
TAJO-1081: Non-forwarded (simple) query shows wrong rows.

Closes #175
TAJO-1081: Non-forwarded (simple) query shows wrong rows. (missed fix for test)
TAJO-1072: CLI gets stuck when wrong host/port is provided. (Jihun Kang via hyunsik)

Closes #169
TAJO-1065: The \admin -cluster argument doesn't run as expected. (Jongyoung Park via hyunsik)

Closes #173
TAJO-1030: Not supported JDBC APIs should return empty results instead of Exception. (Hyoungjun Kim via hyunsik)

Closes #145
TAJO-668: Add datetime function documentation. (Jongyoung Park via hyunsik)

Closes #160
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-1062