New state resolution

Change 'from' in notification pokes to 'sender' to match client API v2. Send sender display names where they exist.

Add default push rules including setting a sound for messages mentioning your username / display name

Extract the device id and token id from the access token when autheniticating users

Extract the id token of the token when authing users, include the token and device_id in the internal meta data for the event along with the transaction id when sending events

Pushers branch (with fixes)