Upgraded Jetty to 9.0.6.v20130930. Added Rhubarb Ping service.
Merge branch 'master' of https://github.com/dieselpoint/rhubarb.git

Conflicts:
	pom.xml
	rhubarb.core/.classpath
	rhubarb.core/src/main/java/io/rhubarb/core/Request.java