Utilize 23505 as the duplicate key when using postgresql
Introduce $result->insertMulti()
Fix $row->table()->fetchPairs('key', 'value')
Add test for non-conventional columns
Rename insertMulti() to be compatible with insert_update()
Implement insert_multi() for MultiResult
Allow retrieving last insert ID

Useful with insert_update(, , array('id' => new NotORM_Literal('LAST_INSERT_ID(id)')))
Merge remote-tracking branch 'upstream/master'
Updated admit() function to call the row setters so that the row returned has the updated data