Migrate d3js to v4 and correct d3js visualisations i.e. bug 3.20. Breadcrumb navigation for the language treemap has been improved
## Default mods
# Base class. Declares default vhost on port 80 and default ssl
# vhost on port 443 listening on all interfaces and serving
# $apache::docroot, and declaring our default set of modules.
class { 'apache':
default_mods => true,
}