fixed coveralls integration
fixed coveralls integration

* sped up code checkout

cjohansen/Sinon.JS,mroderick/Sinon.JS,mroderick/Sinon.JS,mroderick/Sinon.JS,cjohansen/Sinon.JS,fatso83/Sinon.JS,cjohansen/Sinon.JS,fatso83/Sinon.JS,fatso83/Sinon.JS