Sample without replacement.. and without StatsBase or shuffle

General Usage
9

If you actually care about the 3 case, this should be decently fast:

function sample3(n)
    i1 = rand(1:n)
    i2 = rand(1:(n - 1))
    i3 = rand(1:(n - 2))
    i2 += i2 >= i1
    i3 += i3 >= min(i1, i2)
    i3 += i3 >= max(i1, i2)
    return i1, i2, i3
end
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