Allow conditional imports, see examples/playbook3.yml comments for a full explanation. Extensive

refactoring of playbooks now warranted, which we'll do before we move on.   This variable assignment
system makes nearly all possible magic possible, for we can use these variables however we like,
even as module names!

test/CentOS.yml

@@ -0,0 +1,4 @@
+---
+# could test something different here but want people running tests on
+# different OS platforms to still have passing tests
+testing: default