Add react-cardstack to package.json

Author: marcodearaujo

package.json

@@ -29,6 +29,7 @@
     "npm-run-all": "^3.1.0",
     "path": "^0.12.7",
     "react-addons-test-utils": "^15.3.2",
+    "react-cardstack": "^0.1.1",
     "react-test-renderer": "^15.3.2",
     "style-loader": "^0.13.1",
     "url-loader": "^0.5.7",