Fix doc string to reflect implementation

Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Niklas Hambuechen <niklash@google.com>
Cabal: Relax deps to lifted-base-0.2.1.1, snap-server-0.8.1

These are the versions in Fedora 18.

Tested on our buildbot.

Signed-off-by: Niklas Hambuechen <niklash@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>
Cabal: Relax deps to allow QuickCheck-2.7

Tested on our buildbot.

Signed-off-by: Niklas Hambuechen <niklash@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>
Cabal: Relax deps to allow lifted-base-0.2.0.3

That's the version on Debian Jessie.

Tested on our buildbot.

Signed-off-by: Niklas Hambuechen <niklash@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>