Changes to integer-simple

Changes to integer-simple:
commit 9e8b924f68c4cdb6c7ae88f274baa3560aaa305e
Author: Herbert Valerio Riedel <hvr@gnu.org>
Date:   Fri Jan 3 12:04:27 2014 +0100

    Use a more sensible `hashInteger` implementation

    This makes `hashInteger` behave the same way as `integer-gmp`s
    `hashInteger`.

    Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>