I want to add env variables to new instances

I want all my deployments to have access to postgres, thus I'm creating a plugin which sets up a new user with access to a new database (on a postgres server in a different container). I want to expose the database access with an env variable, just like heroku does. To me it looks like release is the best place to put this hook.
Added X-Forwarded-For to pass client IP to backend
issue #138: added wildcard support
Use apt to install lxc-docker vs downloading the .deb
Merge pull request #150 from rhy-jot/master

Use apt to install lxc-docker vs downloading the .deb
Hint about build packs requiring config files

Add a hint to the README that buildpacks may require special configuration files (such as a Procfile) in order to deploy properly.
Merge pull request #154 from darkpixel/patch-1

Hint about build packs requiring config files.  Closes GH-141
Fix bootstrap on clean install

On a clean Ubuntu 13.04 install, the bootstrap script fails with:
make: apt-add-repository: Command not found
make: *** [docker] Error 127

This happens because 'software-properties-common' needs to be installed.
review comment by @rhy-jot
Link to Heroku node.js sample app

Link to the app so users can easily follow along.
Merge pull request #158 from amaltson/patch-1

Fix bootstrap on clean install
Merge pull request #159 from amaltson/patch-2

Link to Heroku node.js sample app
Merge pull request #146 from alexanderbeletsky/ssl2

issue #138: added wildcard support
Build image from Dockerfile instead of curl S3
Add git & dokku to the docker group, creating it if it doesn't exist.
Merge pull request #173 from rhy-jot/2013-08-13/docker-group

Add git & dokku to the docker group, creating it if it doesn't exist.
Mention and link plugin page in the readme
Merge pull request #145 from msumpter/patch-2

Added X-Forwarded-For to pass client IP to backend
Redeploy apps on reboot, fixes #82
Merge pull request #178 from asm89/redeploy

Redeploy apps on reboot, fixes #82