test: add sudo and correct g++ version for node 4+ in .travis.yml (#70)
test: add sudo and correct g++ version for node 4+ in .travis.yml (#70)

* test: add correct g++ version for node 4+ in .travis.yml

* fix: make NODE_ENV and CXX global in .travis.yml

* test: add sudo to .travis.yml

jamemackson/lux,postlight/lux,kureuil/lux