Add test script to package.json

Author: jakezatecky

package.json

@@ -19,7 +19,8 @@
   "scripts": {
     "build": "gulp build",
     "examples": "gulp examples",
-    "gh-deploy": "git subtree push --prefix examples/dist origin gh-pages"
+    "gh-deploy": "git subtree push --prefix examples/dist origin gh-pages",
+    "test": "gulp test"
   },
   "peerDependencies": {
     "react": "^15.3.0"