Authenticate already logged-in users by scanning qrcode.
; boostrap.make
projects[qrauth][subdir] = "contrib"
projects[qrauth][download][url] = "https://github.com/simonsystem/drupal-qrauth/archive/7.x-1.0.zip"
projects[qrauth][download][type] = "get"
$ drush make bootstrap.make
git submodule add git@github.com:simonsystem/drupal-qrauth.git sites/all/modules/contrib/qrauth
mkdir -p sites/all/libraries/qrauth
wget -qO- http://release.larsjung.de/jquery-qrcode/jquery-qrcode-0.11.0.zip | bsdtar -C sites/all/libraries/qrauth -xvf-
drush pm-enable qrauth