Add custom prop isOwn to descriptor
Add custom prop isOwn to descriptor

Makes it possible to see if the descriptor
originates from the object or its prototype chain

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