Merged revisions 1604781, 1604788 from tomcat/trunk:
- Add support for parsing the extension header
- Strengthen WebSocket extension parameter validation


git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1624760 13f79535-47bb-0310-9956-ffa450edef68
Merged revisions 1604776, 1604818 from tomcat/trunk:
- Add an interface for the transformation (by an extension) of WebSocket frames. Only supports transformation of incoming messages at this point.
- Add some inner classes that will be required when Transformation / extension support is plumbed in.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1624761 13f79535-47bb-0310-9956-ffa450edef68