4.5.3-r2

WordPress 4.5.3 running on php:5.6-apache, Autopilot Pattern implementation revision 2.

Changes from #23 and #24:

• Updated nginx/etc/containerpilot.json for co-processes and telemetry
• Changed Nginx health check URL to more specific path to reduce likelihood of conflicts
• Replace Consul image with https://github.com/autopilotpattern/consul
  • See notes in docker-compose.yml for how to run Consul as an HA raft
• Add build notes