Clack depends on Drakma for Clack.Test. Because of that, Clack doesn't work on Windows.
Not only this component, there are many components should be separated from the Core, such like CL-Base64 (This is used in Clack.Middleware.Auth.Basic). In this issue, separating needless components into other systems to reduce dependencies.
(refs #33) got rid of dependence on metabang-bind.