How to generate the permutation of a vector with elements selected from a certain set

General Usage
3

Eg something like

all_perm(xs, n) = vec(map(collect, Iterators.product(ntuple(_ -> xs, n)...)))

would give you

julia> all_perm([0, 1], 3)
8-element Array{Array{Int64,1},1}:
 [0, 0, 0]
 [1, 0, 0]
 [0, 1, 0]
 [1, 1, 0]
 [0, 0, 1]
 [1, 0, 1]
 [0, 1, 1]
 [1, 1, 1]
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