Fix for issue #39

Minimal Ubuntu installs require a separate package to use https for
apt repos, which the docker image uses

manifests/install.pp

@@ -12,6 +12,10 @@ class docker::install {
 
   case $::osfamily {
     'Debian': {
+
+      ensure_packages(['apt-transport-https'])
+      Package['apt-transport-https'] -> Package['docker']
+
       if ($docker::use_upstream_package_source) {
         include apt
         apt::source { 'docker':

spec/classes/docker_spec.rb

@@ -17,6 +17,7 @@ describe 'docker', :type => :class do
 
   context 'with no parameters' do
     it { should contain_class('apt') }
+    it { should contain_package('apt-transport-https').that_comes_before('Package[docker]') }
     it { should contain_package('docker').with_name('lxc-docker').with_ensure('present') }
     it { should contain_apt__source('docker').with_location('https://get.docker.io/ubuntu') }
     it { should contain_package('linux-image-extra-3.8.0-29-generic') }