[in the wild] add userify

Author: hshoff

README.md

@@ -1368,6 +1368,7 @@
   - **National Geographic**: [natgeo/javascript](https://github.com/natgeo/javascript)
   - **Razorfish**: [razorfish/javascript-style-guide](https://github.com/razorfish/javascript-style-guide)
   - **Shutterfly**: [shutterfly/javascript](https://github.com/shutterfly/javascript)
+  - **Userify**: [userify/javascript](https://github.com/userify/javascript)
   - **Zillow**: [zillow/javascript](https://github.com/zillow/javascript)
 
 ## <a name='translation'>Translation</a>