Release an updated version of publication's supplementary data #29

Would it be possible to add a tutorial (requested in Issue #21 as well) in the form of the original publication's supplementary data https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4885658/ ? Since there is no usage information and no vignettes, we are stuck with using version 1.2.1. Looking through the changelog it looks like lots of good things have happened since then, and I'd love to be able to use version 4.0 but am completely in the dark about which commands to use...