Install rimraf

Author: rgbkrk

package.json

@@ -42,6 +42,7 @@
     "mocha": "^2.4.5",
     "react": "^15.0.1",
     "react-addons-test-utils": "^15.0.1",
-    "react-dom": "^15.0.1"
+    "react-dom": "^15.0.1",
+    "rimraf": "^2.5.2"
   }
 }