new testbuild able to boot into XFCE automatically

Since manjaro's hardware detection is still not ported I came up with a simple bash-solution based on suse's hwinfo. Might not be perfect but it works.

Also I replaced gdm with lxdm which saved me some space on the image too.
Adding some small changes I'm now able to boot into XFCE without installing any xf86-video drivers by hand.

For detailed changes checkout my git-repository or download 0.0.7.1 to check it out on your own hardware ...