Added tomcat symlink to decouple configuration

Adding a symlink removed the need for hardcoding the tomcat version into
the configuration, which should allow easier upgrading and fault
tolerance.
Fixed an issue with a missing variable assignment

The 'path' variable assignment was missing and has been readded.
Fixed incorrect path for tomcat symlink

Tomcat symlink was placed in the wrong spot and has now been fixed and
placed in the right place.
Removed tomcat version hardcoding

Tomcat now uses two variables as mush as possible to display its full
filename - the tomcat_filename variable and the tomcat_version variable.
This should allow greater flexibility.
Removed the last of the hardcoding for tomcat

Last bits of hardcoding removed from the title of the tasks.
Merge pull request #24 from ausaccessfed/feature/startup-scripts

Minor tweaks including creation of a symlink and tomcat.service modifications