Your project is interesting to me because I have the same issue about implementation of some services.
The last Tomcat release (8) introduce some interesting features like websocket, so it can be a good idea to update your project.
AFAIK embedded API changed in Tomcat 7, so this project cannot be updated easily to Tomcat 7/8. I am going to support Tomcat 7 and 8 in future but have now estimates right now.
Your project is interesting to me because I have the same issue about implementation of some services. The last Tomcat release (8) introduce some interesting features like websocket, so it can be a good idea to update your project.