Run tests in node 4.1.x also
Run tests in node 4.1.x also

andpor/sinon,cjohansen/Sinon.JS,jishi/sinon,cjohansen/Sinon.JS,mroderick/Sinon.JS,Khan/Sinon.JS,fatso83/Sinon.JS,mroderick/Sinon.JS,fatso83/Sinon.JS,Khan/Sinon.JS,timwienk/sinon,jishi/sinon,Khan/Sinon.JS,andpor/sinon,timwienk/sinon,timwienk/sinon,cjohansen/Sinon.JS,jishi/sinon,fatso83/Sinon.JS,andpor/sinon,mroderick/Sinon.JS