Improve message when JSR356 support not available

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1525277 13f79535-47bb-0310-9956-ffa450edef68
Fix typo

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1525278 13f79535-47bb-0310-9956-ffa450edef68
Restore Tomcat 7 WebSocket examples. The examples and the code is marked as deprecated.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1525279 13f79535-47bb-0310-9956-ffa450edef68