Output type conversion vignette (explanation and plans)

[lshandross]

I've put together a vignette-like write-up about converting between output types in the hubverse, which covers why we're interested in implementing this functionality (including some examples), what exactly we're planning to implement, and how it will be achieved. You can view the write-up in several ways on a branch in the hubUtils repo:

• The main RMD file
• An HTML preview

You can view some of the initial discussions about output type conversion on hubData Issue #11, which links to other related issues