Added how-can-i-help to installed packages.
Added command for purging configuration.
Use HTTPS instead of HTTP (digabi.fi is now enforcing use of HTTPS).
Install apt-transport-https.
Added note about managing GitHub issues via CLI.
Merge file:///vagrant/_live/digabi-live into dev

* file:///vagrant/_live/digabi-live:
  Added note about managing GitHub issues via CLI.
  Added how-can-i-help to installed packages.
Added submodule digabi-feedback.
Added digabi-buildbox as submodule.
Added submodule for digabi-live-extras. Closes #29.