aimalz/qp: v0.2-beta

qp has grown quite a bit since v0.1-beta and is overdue for a release. The code in this release is being used in a number of ongoing projects with users beyond the developers. qp is about to undergo a refactoring that will affect the API (in good ways!) that could break existing code that uses qp. The goal of this release is to make it easy for established users to continue running and sharing code with this version's API while also setting the stage for future use of a more polished version. This release will also be associated with a DOI as a test case for an eventual non-pre-release DOI for arXiv.