Using trial as test runner with zc.buildout

I've found a good way to launch tests using Twisted Trial in a zc.buildout enabled project. I was in fear of needing a full-fledged recipe - which I didn't have the time nor the will to code.

Luckily, zc.recipe.egg seems good enough to satisfy my needs; I wanted a recipe that could launch all unit tests if no parameter was passed, while retaining the ability to choose which specific unit test was launched on command line.

Here it is:

That's filled in for pydenji