use explicit column lists instead of RETURNING *  [fixes #38]
use explicit column lists instead of RETURNING *  [fixes #38]

The use of RETURNING * was unsafe since we get column orders that
might not match their context of use. This caused the update and insert
CTEs in the entity PUT handler to have different column orders.

informatics-isi-edu/ermrest,ini-bdds/ermrest,ini-bdds/ermrest,informatics-isi-edu/ermrest