partitionplot doesn't work if variable is integer

[piever]

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julia> t = table(rand(1:100, 1000), rand(1:100, 1000); names = [:a, :b]);

julia> partitionplot(t, :a, :b)
ERROR: Extrema hasn't implemented `_fit!(::OnlineStat{T}, ::T)` yet.

The same works fine if instead :a and :b are columns of Float64

[joshday]

Try adding the keyword arg stat = Extrema(Int). As soon as I find some time, I need to clean up a bit of the partitionplot code.

[piever]

OK, then it's probably better to keep it out of the tutorial for now and we can add it once it's cleaned up and we're sure about the API.