Test failing due to latex

[mykelk]

It looks like we have an issue with testing on the travis build due to missing luatex85.sty. Should we not have TikzPictures as part of the testing? Or should we add the dependency to have a proper install?

[zsunberg]

Yes, that seems like a good idea - we also could just switch to a Compose-based approach. If it is for the lasertag problem. I have a compose-based visualization for a similar problem here: https://github.com/zsunberg/DMUStudent.jl/blob/1db6d1de32f81df43cb1ee36ea1d4263b5c1d708/src/HW6.jl#L199

Adding TikzPictures is probably the easiest fix.