setoid, semigroup, monoid, applicative
remove compiled specs, quick text update
remove setoid
remove play script
Minor formatting stuff.

--HG--
extra : amend_source : d73c1cef21db07b4044e1ae6446a5e65202b852c
Bumps to 2.2.0.

Includes Monoid, Semigroup and Applicative instances.