Renamed jspserver folder to tomcat

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

Role folder 'webserver' has been renamed to 'apache' for greater
clarity. Main playbook file has also been updated to account for this.
Renamed timeserver directory to ntp

Role directory 'timeserver' has been renamed to 'ntp' for greater
clarity. The main playbook file has also been updated to account for
this change.