Add JSDocs

[Morgul]

We have a workable ReadMe, and a fair amount of comments in the source code, but we need to formalize our documentation, and start generating it. We should setup jsdoc (as well as probably making TravisCI build our documentation and publish to gh-pages).

Here is a description of how to do it: https://medium.com/@nthgergo/publishing-gh-pages-with-travis-ci-53a8270e87db