Release 0.1.4

- add package support to source-repositories
- add new modprobe-blacklist element
- add a package mapping for libvirt-dev
- implement dhcp-all-interfaces for systemd (bug 1239880)
- fix command dib-init-system not found error
- fix device or resource busy issue in EXIT trap
- install tcpdump on Fedora
- install traceroute on Fedora
- retry link check up to 10 times
- increase padding to allow for smaller images
- remove old versions of grub2 from the yum cache
- mark install-packages +x
- make sure a loop device exists before kpartx is called (bug 1195264)
- refactor unmount_image with unmount_dir
- remove the config-applier element