* incomingQ.cabal: Downgraded Control.Errors

Looks like Control.Errors has a bug in 1.3.1 when compiling on GHC 7.6

Control/Error/Util.hs:74:10:
    Could not deduce (Monad m) arising from a use of `fmap'
    from the context (Functor m)
      bound by the type signature for
                 fmapRT :: Functor m => (a -> b) -> EitherT l m a -> EitherT l m b
      at Control/Error/Util.hs:74:1-13
    Possible fix:
      add (Monad m) to the context of
        the type signature for
          fmapRT :: Functor m => (a -> b) -> EitherT l m a -> EitherT l m b
    In the expression: fmap
    In an equation for `fmapRT': fmapRT = fmap

So we'll just downgrade (for now!)