Moved api-keys out of 'sight', and added analytics as optional

README.md

@@ -24,6 +24,8 @@ mongo_config.js
 
 in ```/server/config```. There are ```*.example.js``` files for all the ones mentioned above. If you're going to deploy the server with a certificate, you also need to create the ```cert_config.js``` in ```/server/config/```. If you want the mailing to work, take a look at ```mailconfig.example.js``` and ```recaptcha.example.js```. You'll need ```mailconfig.js``` and ```recaptcha.js``` for this to work.
 
+If you want to use Google Analytics, have a look at ```analytics.example.js``` in ```server/config/```.
+
 Use ```$ npm start``` to start the server.
 
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