Merge branch 'add_home_to_upstart_config' into 'master'

Add HOME to the Upstart config example

This seems to be a good idea.

See merge request !12

lib/support/upstart/gitlab-ci-runner.conf

@@ -24,6 +24,7 @@ chdir /home/gitlab_ci_runner/gitlab-ci-runner
 script
   # optional: set PATH or other environment variables
-  # export PATH=/foo:/bar
+  # export PATH=/home/gitlab_ci_runner/.rvm/rubies/default/bin:$PATH
+  export HOME=/home/gitlab_ci_runner
   exec bundle exec bin/runner
 end script