Some kind of release

Now Mirror Walker can actually walk most of the mirrors. I think, it can be begged as the first actual release. By now I tested booting CentOS and Ubuntu. It works fine, although takes a lot of time to load 16MB directory list. The plan is:

* Finalizing UI (make it fancier)
* Optimizing creating catalogs if possible
* Think of making directory structure more compact (maybe unstaging it at all)