proposed change to transformers package

[Henning Thielemann]

Ross Paterson schrieb:
> I propose to rename some of the modules in the transformers package so
> that it no longer conflicts with the mtl package:
> 
>   Control.Monad.Identity renamed as Data.Functor.Identity
>   Control.Monad.Trans split between Control.Monad.Trans.Class and
>         Control.IO.Trans.Class

+1