Added MySQL error code 1451 'ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails' in Connection_Mysql_Exception. Fixes #856.
Added MySQL error code 1451 'ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails' in Connection_Mysql_Exception. Fixes #856.

git-svn-id: 0eab93f09deb31554551c4bcbed1609610017ba3@3979 625475ce-881a-0410-a577-b389adb331d8

ascorbic/doctrine-tracker