download tarball and extract to ~/apps
include default_app
use correct class name
add "/bin" to path
Apps directories owned by pi user
Install foreman-export-initscript gem
install_apps script

Add an install_apps script which iterates over all of the subdirectories
of /home/pi/apps, runs `bundle install` and `foreman install` as
required.
install apps and start the default app on boot
start apps script
start apps on boot
Merge default_app branch.