db:migrate:redo schema dump bug

Hi guys,

Could I get some love for #1412, "db:migrate:redo does not dump the
schema after migrating back up"?

If you do a rake db:migrate:redo, the schema dump you end up with is
from after the down-migration, before the up-migration. My patch
fixes that. It's been well-tested here and IMHO should be fine to go
into Rails 2.3.