also provide an OpenSesame implementation

[drbenvincent]

The way how I've coded this is very general. We have the core bad and darc python packages, and so far we are using PyschoPy as the 'experimental glue' which uses classes from these packages. But there is absolutely no reason why we can't or shouldn't integrate this into OpenSesame.

Right now the focus is on getting this package working and reasonably fully featured. So I will aim to come to this further down the line... unless someone else wants to do this as a homework assignment and submit a pull request. If you want to do that, just get in touch, maybe comment here in fact.