Update README.md
Update to latest Spring Framework 4.0 snapshot changes
Update README.md
Make use of the new @EnableWebSocket Java config
Fix scope semantics

The Snake handler must be created for each new connection based on how
it is written.

The echo handler on the other hand is stateless.
Polish EchoWebSocketHandler
Update README.md
Merge remote-tracking branch 'choose_remote_name/master'