[WIP] Debian package for linux

[rllola]

• [x] debian package control files
• [x] make script
• [x] .desktop file (https://github.com/HelloZeroNet/ZeroBundle/issues/18)
• [ ] Dynamically create the file with correct version

The last point will depend on how the new releases are created. It will need to modify the version in control and zeronet.desktop at each update...