Fix version pinning for sinon

bower.json

@@ -32,7 +32,8 @@
   "resolutions": {
     "backbone": "1.1.2",
     "requirejs": "~2.2.0",
-    "jquery": "1.12.2"
+    "jquery": "1.12.2",
+    "sinon": "^1.17.3"
   },
   "exportsOverride": {},
   "ignore": [