Migrate d3js to v4 and correct d3js visualisations i.e. bug 3.20. Breadcrumb navigation for the language treemap has been improved
# See https://help.github.com/ignore-files/ for more about ignoring files.
# compiled output
/dist
/tmp
# dependencies
/node_modules
/bower_components
# misc
/.sass-cache
/connect.lock
/coverage/*
/libpeerconnection.log
npm-debug.log*
testem.log