Add remember_token migration.

Signed-off-by: crynobone <crynobone@gmail.com>
Fixes testcase namespace.

Signed-off-by: crynobone <crynobone@gmail.com>
Update tests.

Signed-off-by: crynobone <crynobone@gmail.com>
Add changelog and tweak migration.

Signed-off-by: crynobone <crynobone@gmail.com>