Fixing up javadoc issues in WebSocket classes
Fixing javadoc in jetty-util that JDK 1.7 complains about
Fixing javadoc in jetty-client that JDK 1.7 complains about
Fixing Javadoc errors that JDK 1.7 complains about
Fixing javadoc generation in jetty-all

+ Added missing javax artifacts to jetty-all pom
+ Moved javax.websocket versioning to top level pom