TAJO-985: Client API should be non-blocking. (jinho)
TAJO-1007: Update site for new committer and new contributors.

Closes #120
TAJO-1009: A binary eval for column references of the same tables should not be recognized as a join condition.

Closes #121
TAJO-984: Improve the default data type handling in RowStoreUtil. (jihoon via hyunsik)
TAJO-1011: EvalTreeUtil::isJoinQual need to handle other join conditions. (jaehwa)
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/tajo into TAJO-704