Upgrade sinon to 2.1 (closes #123)

Author: princed

package.json

@@ -38,7 +38,7 @@
     "chai-dom": "^1.2.2",
     "chai-jquery": "^2.0.0",
     "chai-things": "^0.2.0",
-    "sinon": "^1.17.2",
+    "sinon": "^2.1.0",
     "sinon-chai": "^2.8.0"
   },
   "devDependencies": {