factored out web demo into activemq-web-demo
made activemq-web just produce a jar
added amq.js as a resource to the jar
added AjaxServlet to extend MessageListenerServlet with the ability to serve amq.js
cleaned up m2 build and dependencies
added jetty6:run plugin to run the demo.
git-svn-id: https://svn.apache.org/repos/asf/incubator/activemq/trunk@392913 13f79535-47bb-0310-9956-ffa450edef68