Added Safe Haskell annotations
Version 3.0.0 => 3.1.0
Added 2013 to copyright year
Reorganized functor functions and updated documentation
Fixed MFunctor re-export in Control.Proxy.Core
Keep just the Trustworthy annotation for now
Removed tell/put/get exports and made Writer Lazy
Tidied up source code
Narrowed yield's type signature
Updated documentation