Modifications to the scripts, extra metadata in deb

- Add maintainer field,
- Stop the service before removing the tomcat package
- Ensure the entire tomcat directory is deleted when removing the package
Remove the upstart script on apt-get purge
Make use of fpm's multiple directory locations functionality

 - Allows specification of upstart script
 - Uses /var/lib/tomcat as the source directory
Moves the tomcat configuration to /etc/tomcat.

 - Looks like files specified by hard link, so config changes in
   /etc/tomcat are reflected on boot of tomcat
 - Might lead to problems if disk partitioned