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Implement Semigroup as a superclass of Monoid Proposal (Phase 1)
More details in prime:Libraries/Proposals/SemigroupMonoid ### Phase 1 (GHC 7.12) Phase 1 consists in (at the very least) moving `Data.Semigroup` and `Data.List.NonEmpty` into `base` for GHC 7.12 (aka 8.0). If there's enough time we will also implement a warning as part of the first phase: > Add a warning about definitions of an operator named `(<>)` that indicate it will be coming into Prelude in 7.14. We should warn about missing Semigroup instances at any use site of `(<>)` as they'll break in 7.14.
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