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)')))
jsonAsArray flag, to enable json serialization as plain data array
Debug using error_log() instead of stderr by default
Allow updating primary key of a row
Fix repetitive use of the same MultiResult
Allow using float keys in fetchPairs(), fixes #49
Allow null values in fatchPairs()
Support $result->and()
Support $result->or()
Support closing WHERE parentheses