The guide to setting up GCM here: https://developer.android.com/google/gcm/client.html specifies:
Caution: When you add the Play Services library to your project, be sure to add it with resources, as described in Setup Google Play Services SDK.
Then the page it links to (https://developer.android.com/google/play-services/setup.html#Setup) never mentions the 'with resources' bit.
Does anyone know what this means, as I fear I've missed something when setting up my play services project.