Added a Thread.sleep()

So the job has a chance to finish. Yes, I know that this should
be done with a ProgressMonitor, but getting one that deep right
now is a bit too much work.

This is the lazy-man approach to completion.
Added tear-down method that deletes all the zip files
Using the field
Added test for dependent projects

A bit useless, but it's there, why not. Oh, and it does not catch the
bug...