* Tomcat Variable
I don't know a good way to know which tomcat version is already running, and of course someone could theoretically run more than one...so the upgrade script is just a variable but the install script will check apt-cache and try to install tomcat8, then tomcat7, then tomcat6...
* Optional commented line
Added a commented out line in case someone wants to force an older/specific tomcat install
If the schema upgrade needs to happen then the file name would exist with the current version's name so it's easy enough to check for and run if necessary.
