converted spy to commonjs format
converted spy to commonjs format

* sinon/core.format is the last non-cjs piece

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