Update init.pp test with relationships

This shows the module user how relationships can be easily added
to the main nginx class without peeking inside the guts of the module.

tests/init.pp

@@ -1,2 +1,9 @@
-include nginx
-
+# The notify before should always come BEFORE all resources
+# managed by the nginx class
+# and the notify last should always come AFTER all resources
+# managed by the nginx class.
+node default {
+  notify { 'before': }
+  -> class { 'nginx': }
+  -> notify { 'last': }
+}