- added helper tool called livestick:
  + allows deployment of live ISO images on USB sticks without
    destroying any data on the stick. The system is based on
    grub2 which loads via loopback the kernel and the initrd
    from the transfered iso image file. In addition to that
    custom writing happens into a cowfile and not into a
    partition. Using livestick recommends the use of the
    overlayfs filesystem (flags="overlay") because that has
    proven to work fast and nicely with a cowfile
- added support for overlayfs as root filesystem for the
  disk based image types oem and vmx. Unfortunately the
  tool chain is not really prepared for such systems.
  I found the following issues which are not a kiwi
  business:

  * grub2-mkconfig failed to get canonical path of overlayfs
  * mkinitrd does not work if the rootfs is an overlayfs

  Thus when building an image with filesystem="overlayfs"
  it can be booted only once with the kiwi initrd. the
  subsequent reboot failed when using grub2. funny enough
  with the legacy grub it works because kiwi writes the
  config in this case
- fixed typos: Replace "(c|C)onfiguartion" with "(c|C)configuration"
- fixed typos: Replace "(c|C)onfiguartion" with "(c|C)configuration"
- fixed typos: Replace "(c|C)onfiguartion" with "(c|C)configuration"
- DB: rebuild documentation