Add and Configure Spring Boot Actuator

Update metrics check - enable auto configuration - no need to register the class to the HealthCheckRegistry
Update webConfigurer - Add a custom class of the Codahale HealthCheckServlet - Now return status code 200 instead of 500 when one of the check is set to false
Update GzipServletResponseWrapper to fix an error when printer is used
Update metrics.html - add healthcheck section and makes Services statistics and ehcache statistics generics