workers on the analysis machines assume all zips are extracted to /home/DotNetBot

shutil.rmtree('/home/DotNetBot/') # This will likely not work in the future when we receive dumps from other people.

@schaabs is currently experimenting with how zip files are extracted. Perhaps via #13 we can declare that coreunzip/downzip return a list of files. This could be used to locate core files, as well as help clean up more efficiently.