introduce a curried form of binarize

[johnnychen94]

It would be convenient to make binarize(alg) return a function so that

map(binarize(Yen()), imgs)

This is equivalent to binarize.(Ref(Yen()), imgs) but a function can be composed together with other functions using ∘, or eventually the |> API similar to that in Augmentor:

pipeline = FlipX(0.5) |> Rotate([-5,-3,0,3,5]) |> CropSize(64,64) |> Zoom(1:0.1:1.2)

Cases that I know in Base are isequal, isapprox(in Julia 1.5), startwith(in Julia 1.5) and endswith(in Julia 1.5):

julia> map(isequal(2), 1:5)
5-element Array{Bool,1}:
 0
 1
 0
 0
 0