- Added support for autogenerate covering the use case where :class:`.Table`

- Added support for autogenerate covering the use case where :class:`.Table`
objects specified in the metadata have an explicit ``schema`` attribute
whose name matches that of the connection's default schema
(e.g. "public" for Postgresql).  Previously, it was assumed that "schema"
was ``None`` when it matched the "default" schema, now the comparison
adjusts for this. #170