Feat: add react test utils to package.json

Author: RyanCCollins

package.json

@@ -106,6 +106,7 @@
     "node-sass": "^3.4.2",
     "react": "^15.1.0",
     "react-addons-css-transition-group": "^15.2.1",
+    "react-addons-test-utils": "^15.3.2",
     "react-dom": "^15.0.1",
     "react-foundation": "^0.6.8",
     "react-intl": "^2.1.3",