Integrate with Hspec

[erikd]

I've started work on a hspec-hedgehog wrapper.

Its going to need some supporting functionality in Hedgehog.

[thumphries]

@erikd how far did you get with this? I now find myself in a hspec shop, might jump in.

[erikd]

I got no further than the what I have in the repo above. Since I've switch to hedgehog for my new tests and I'm switching older hspec to hedgehog as needed, I will probably not be pursuing the above any further.

[FintanH]

@thumphries I'd be willing to help out on this :)

[arianvp]

How about https://github.com/haskell-works/hw-hspec-hedgehog