Option to expand partition and rootfs on first boot Initial version from vknecht

Option to disable rsyslog and improvements (also security) - Introduce chroot_exec function - Allow choosing custom kernel - Install raspberrypi-bootloader-nokernel package instead of getting firmware with wget - Option to disable rsyslog and use only journald - [SECURITY] ensure ssh host keys are generated on first boot - allow control if default user is created - allow control of root ssh login

Merge branch 'rootfs-size-calculation-improvement' of https://github.com/stylesuxx/rpi2-gen-image into stylesuxx-rootfs-size-calculation-improvement

Merge branch 'stylesuxx-add-custom-packages'

Merge branch 'add-custom-packages' of https://github.com/stylesuxx/rpi2-gen-image into stylesuxx-add-custom-packages

Make the rootfs partition 20% bigger than the used size of the chroot directory

Added functionality to run custom scripts after base bootstrap

Added functionality to add custom packages to APT_INCLUDES

Merge branch 'vknecht-net-static'

static ip patch by vknecht