Add IterateeCPS, mostly for performance optimization, but need to actually compare with the current iteratee.
Add IterateeCPS, mostly for performance optimization, but need to actually compare with the current iteratee.

bryanedds/FSharpx.Extras,fsprojects/FSharpx.Extras,bryanedds/FSharpx.Extras,fsprojects/FSharpx.Extras,sideeffffect/FSharpx.Extras,bryanedds/FSharpx.Extras,sideeffffect/FSharpx.Extras