be more general with adapter name

Hi,
a lately subclassed the postgres adapter as I needed very special features in a project. Unfortunately the dbconsole wasn't working any more. The cause is a too strict comparison. The mysql adapter test is more general why shouldn't the postgres be more general ,too? I didn't change the others but I think they could also be more general. I don't think somebody will name their adapter "mysql-oracle-postgis".

THX
let's add the `^` anchor similar to what MySQL uses.