Added tests based on hspec and quickcheck
Cleaned up test code
Made tests faster / be friends with Travis
Merge branch 'justTests' of https://github.com/jcristovao/retry into jcristovao-justTests

Conflicts:
Merge branch 'justTests' of https://github.com/jcristovao/retry into jcristovao-justTests

Conflicts:
	retry.cabal
	src/Control/Retry.hs
	retry.cabal
	src/Control/Retry.hs
Get tests working with latest API and switch to microseconds for speed