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Implements semigroup, monoid, functor, applicative and monad for IFn.
I asked in #52 which semigroup. monoid implementation would be preferred but after attempting to implement Haskell's default, I'm not sure it's possible with the context system (certainly not in a nice way). So I implemented
mappend
ascomp
andmempty
asidentity
instead which has the added advantage be being much simpler.