Wordpress metrics

include request count metrics for wordpress, so can wire up auto-scaler policy

TODOs:
- The way it configures /etc/httpd/conf/httpd.conf isn't great. But @grkvlt is working on a httpd entity for some of the stuff he's going.
- I had this branch pointing at 0.5.0-SNAPSHOT rather than M2 for some reason. I really need to re-test against M2 to find out if there was a good reason for that, but I haven't done yet!