Added (very short) instructions for setting up a Debian mirror.
Updated Digabi repository key.
Merge branch 'master' of github.com:digabi/digabi-live into upstream-master

* 'master' of github.com:digabi/digabi-live: (25 commits)
  Added (very short) instructions for setting up a Debian mirror.
  Use Windows-style line-endings (CRLF) instead of UNIX (LF).
  Use Windows-style line-endings (CRLF) instead of UNIX (LF).
  Fixed previous merge.
  Do not add experimental suite.
  Install Iceweasel from jessie.
  Remove lxpolkit.
  Disable suite wheezy.
  Fixed installation of buildbox packages: run as sudo.
  Fixed shared folder name.
  Do not remove /etc/apt/apt.conf inside Vagrantbox.
  Fixed reading Digabi version number.
  Configuring APT.
  Fixed typo.
  Fixed init script: removed premature exit call.
  Fixed syntax error.
  Show message when running local scripts.
  Added support for local Vagrant customizations.
  Ignore local Vagrant provision script.
  Use new naming style for hooks. (*.hook.chroot).
  ...