don't really send push notifications in test env
don't really send push notifications in test env

@robbiecarlton: i just wrote a test that calls the push notification
code, and i’m putting this in here as a temporary fix. is there a test
key we can use so that we can test connectivity to the API without
attempting to send out real messages?

Connoropolous/hylo-node,Hylozoic/hylo-node,Hylozoic/hylo-node,Connoropolous/hylo-node,Connoropolous/hylo-node