Migrate d3js to v4 and correct d3js visualisations i.e. bug 3.20. Breadcrumb navigation for the language treemap has been improved
- Allow installation of drush 5.
- with pear? -> hard dependency on a puppet pear module?
- from tarball? -> for any version of drush. example42/puppi may help?
- Fix version management.
- Alias 7 to master / dev-master