This PR fix several issues, in particular:

Part of issue #389, specifically following code

for k = 1:4
    data = rand(1,10);
    subplot(2,2,k)
    stem(data)
end;
subplot(2,2,2,'replace');

attach the fixing result bellow

Combine Multiple Plots

Reference link. Now fig2plotly works for examples there!

attached the fixing results bellow

Specify Axis Tick Values and Labels

Reference link. Now fig2plotly works for examples there!

attached the fixing results bellow