Documenter.jl: Plot not rendering in `@example` block with Plotly

[mforets]

An example block such as:

```@example example_ih
using LazySets, Plots

X = Ball2(ones(2), 0.5)

(some text)

```@example example_ih
plot(X, 1e-3, aspectratio=1)

displays the plot in my local machine. However, it does not show the plot through the Travis CI setup for that package, with this docs/make.jl. Only empty space is rendered.

This full example is interval_hulls.html

Did you have this problem before? Any hint is highly appreciated :)

[mforets]

We got this working by installing GR in the Travis CI build (by default it was using Plotly), via - julia -e 'Pkg.add("Documenter"); Pkg.add("GR")'. Thus for our purposes i consider this issue as fixed.

[mortenpi]

Thanks for reporting it though -- it might be useful for others in the future. It seems that Plotly does not work because the javascript library it requires does not get loaded properly.