Upgrade to 4.0 M2
Update Jetty version to 9.0.4
Upgrade more dependencies
Update README
Update deployment scripts
Leave WebSocketHandler and SockJS examples only

Endpoint and @ServerEndpoint are in "endpoint" branch
Update readme
Merge remote-tracking branch 'rstoyanchev/spring-websocket-test/master'

Conflicts:
	pom.xml
	src/main/webapp/echo-sockjs.html
	src/main/webapp/echo.html
	src/main/webapp/snake-sockjs.html
	src/main/webapp/snake.html
	src/test/java/org/springframework/samples/websocket/echo/JettyClientApp.java
	src/test/java/org/springframework/samples/websocket/echo/Jsr356ClientApp.java
	src/test/java/org/springframework/samples/websocket/echo/StandardWebSocketHandlerClientApp.java