updated tests for node 4 and npm 3
updated tests for node 4 and npm 3

mrc535s/wkhtmltopdfbp,pkumar-appd/nodejs-buildpack,cloudfoundry/nodejs-buildpack,oocl-ncc-itm/nodejs-buildpack,marnold6/nodejs_buildpack,Scalingo/nodejs-buildpack,nikhil-bhandari/ng-cli-buildpack,karthikeyabhaghavatula/nodejs_buildpack,oocl-ncc-itm/nodejs-buildpack,pkumar-appd/nodejs-buildpack,raghuveerthummeti/nodejs-buildpack,bionikspoon/annotation-tool-heroku-buildpack-nodejs,kauffecup/nodejs-buildpack,goodeggs/heroku-buildpack-nodejs,The18thWarrior/ethereum-buildpack,marnold6/nodejs_buildpack,heroku/heroku-buildpack-nodejs,NSWIDER/nodejs-oracle-buildpack,ks2software/nodejs-buildpack,roder/nodejs-buildpack,caiorogerio/heroku-buildpack-grunt,cloudfoundry/nodejs-buildpack,NSWIDER/nodejs-oracle-buildpack,cheeyeo/heroku-buildpack-nodejs,ks2software/nodejs-buildpack,karthikeyabhaghavatula/nodejs_buildpack,ks2software/nodejs-buildpack,ks2software/nodejs-buildpack,caiorogerio/heroku-buildpack-grunt,apiaryio/heroku-buildpack-nodejs-grunt,tweettypography/heroku-buildpack-nodejs,kudos/heroku-buildpack-nodejs-jspm,fcruxen/heroku-buildpack-nodejs,Scalingo/nodejs-buildpack,glawson6/heroku-buildpack-nodejs,simonjjones/snowedjs_buildpack,Grahahax/nodejs-buildpack,simonjjones/snowedjs_buildpack,sailrish/heroku-buildpack-coffee,Hylozoic/heroku-buildpack-nodejs-babel,Jonatasmz/heroku-buildpack-nodejs,caiorogerio/heroku-buildpack-grunt,bionikspoon/heroku-buildpack-nodejs,totapari/heroku-buildpack-nodejs,shedd/heroku-buildpack-nodejs,Grahahax/nodejs-buildpack,kauffecup/nodejs-buildpack,Scalingo/nodejs-buildpack,Scalingo/nodejs-buildpack,roder/nodejs-buildpack,mrc535s/wkhtmltopdfbp,marnold6/nodejs_buildpack,NSWIDER/nodejs-oracle-buildpack,mrc535s/wkhtmltopdfbp,CloudSide/heroku-buildpack-nodejs,mmgm/nodejs-buildpack,ks2software/nodejs-buildpack,heroku/heroku-buildpack-nodejs,pkumar-appd/nodejs-buildpack,ks2software/nodejs-buildpack,The18thWarrior/ethereum-buildpack,cloudfoundry/nodejs-buildpack,heroku/heroku-buildpack-nodejs,cloudfoundry/nodejs-buildpack,raghuveerthummeti/nodejs-buildpack,ks2software/nodejs-buildpack,Grahahax/nodejs-buildpack,simonjjones/snowedjs_buildpack,heroku/heroku-buildpack-nodejs,diegobent/heroku-buildpack-nodejs,mmgm/nodejs-buildpack,mikeyoon/heroku-buildpack-nodejs,tomfa/heroku-buildpack-nodejs,raghuveerthummeti/nodejs-buildpack,kauffecup/nodejs-buildpack,mmgm/nodejs-buildpack,roder/nodejs-buildpack,shoetomydixi/node_sigma_zapp_buildpack,oocl-ncc-itm/nodejs-buildpack,kirs/heroku-buildpack-nodejs,karthikeyabhaghavatula/nodejs_buildpack,heroku/heroku-buildpack-nodejs,sailrish/heroku-buildpack-nodejs,Amandeepsinghghai/heroku-buildpack-nodejs,Scalingo/nodejs-buildpack