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.
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