Tomcat module attempt
Fileserver module, possibly redundant.
Now disable iptables service so we can access tomcat's manager page.

Setup vagrant file port forwarding from host 8081 to 8080 for the tomcat
manager page.

Added a tomcat-users.xml.erb template to create a manager user with
customisable password, currently hardcoded in the module.

Tomcat is started from the CATALINA_HOME/bin/startup.sh. Service startup
to follow.

Java is now specified as a required module at the beginning of the
tomcat module.

local_install_dir is now a parameter with a suitable default, this is to
prevent clashes with the same java declaration.
Removed the local_installation_var as it is not needed.

The class now references its own name where appropriate to faciliate
refactoring.
Tomcat now starts as a service.

Note this is only guaranteed to work on centos.
Specified a tomcat 7 specific manifest.

Now has a logging directory parameter that will create a sym link from a
location specified to the $CATALINA_HOME/logs directory.

Tomcat users are supported.