[COOK-3529] It should be possible to choose weather or not to create '/etc/mavenrc'


Related to http://tickets.opscode.com/browse/COOK-3529

Since the template is not that extended and could need more of less
commands depending on your setup (e.g. -Xmx, -XX:MaxPermSize), so I
thought it would be best to make the standard template optional, so you
could also use a custom template