* Fix networking with systemd

With newer systemd builds, systemd-networkd does not boot anymore, leading to the network being disabled. Installing libnss-systemd resolves this problem, but it is not available on Jessie systems.

* fast fix for issues/128

untested.

* increased fs overhead from 25% to 35%

the goal is to keep the generated images as small as possible. hope 35% is enough

* fixed: No rule to make target 'firmware_install'

sorry for the delay

* Updated 'command-line examples' to use the sugar templates

* Write fix

* Unzip Dependency