Remove abstract-deque library dependency on test-framework

[tibbe]

Does the library (not the included test suite) need to depend on test-framework? Right now test-framework doesn't build so neither does abstract-deque-0.2.2 and a few dependencies later criterion (which I need right now) doesn't build.

Aside: could you add a

bug-reports: https://github.com/rrnewton/haskell-lockfree/issues

section to the .cabal file so it's easier to find this page.

[rrnewton]

Actually, as written it does, because it expooses some testing utilities for packages that implement the deque interface to use. However, these are annoying extra dependencies so I can factor it into a separate library.