Fixes #1262 - changes the check class for Tomcat 7 Websocket support.
The check for the WebSocketServlet class is replaced with a check for the UpgradeInbound class in the check for support of Tomcat 7 Websockets.
Merge pull request #1263 from bleathem/atmosphere-1.0.x

Fixes #1262 - changes the check class for Tomcat 7 Websocket support.