Add a cabal test-suite

[konsumlamm]

Closes #38.

Additionally, add some small doc comments and remove some unnecessary files.

I tried to build a small framework for testing strategies (two actually, since Control.Seq and Control.Parallel.Strategies have different strategy types, but they're almost the same). Ideas for improvements/alternatives are more than welcome, I'm not particularly happy with my approach. The tests for rparWith don't work, which is why they're commented out, probably because of some multithreading issues (I also tried with -feager-blackholing, but that didn't change anything).