Fix build and bump dependency on 'bound'.

bound 0.8.1 already has prisms for _F and _B - the definitions
in the Scope module then conflict if you have 0.8.1 installed.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Merge pull request #4 from thoughtpolice/fix-build

Fix build and bump dependency on 'bound'.