Changelog for monoid-statistics-1.1.0

Changes in 1.1.0.0

Type classes CalcMean and CalcVar are generalized to use MonadThrow to signal failure instead of using Maybe only
Functions for computing standard deviation are placed into type classes. Sometimes we have standard deviation at hand, if distribution is parameterized by it for example.
Mean now type synonym for MeanKBN.
WelfordMean and KahanMean are moved to D.M.S.Extra module.
Support for calculating weighted mean.
StatMonoid instances for up to 4-tuples.
Max now works correctly (#2).
PPair for use in parallel computation is added.

Type class definition changed: now it has both addValue :: m → a → m and singletonMonoid :: a → m
Mean renamed as WelfordMean
Unbox instances added for all data types.
BinomAcc added.