Revert OldRestfulAuthenticationSha1: (configuration error?)

I realize that I must be missing something, because this code has been
deployed successfully on staging sites. My local problems must be
the result of a local configuration problem....

Maybe the span in development mode?

Revert "Devise: OldRestfulAuthenticationSha`1  Preserve restful password hashes."

This reverts commit d50d76c8f113a34fe1bcdd9aa3d2fd27f80a4235.