Renamed jspserver folder to tomcat

Role folder 'jspserver' has been renamed to 'tomcat' for clarity. Also,
main playbook file has been updated to account for this change.
Renamed webserver folder to apache

Role folder 'webserver' has been renamed to 'apache' for clarity. Also,
main playbook file has been updated to account for this change.
Renamed folder timeserver to ntp

Role folder 'timeserver' has been renamed to 'ntp' for clarity. Main
playbook file has also been updated to account for changes.