Add examples dir

* Sample upstart script
* Sample config file

Author: jwilder

examples/docker-gen.cfg

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+[[config]]
+template = "/etc/nginx/nginx.conf.tmpl"
+dest = "/etc/nginx/sites-available/default"
+onlyexposed = true
+notifycmd = "/etc/init.d/nginx reload"
+
+[[config]]
+template = "/etc/logrotate.conf.tmpl"
+dest = "/etc/logrotate.d/docker"
+watch = true

examples/docker-gen.upstart.conf

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+#!upstart
+
+description "docker-gen upstart script"
+
+start on startup
+stop on shutdown
+
+respawn
+
+exec start-stop-daemon --start --exec /usr/bin/docker-gen -- -config /etc/docker-gen.cfg