Add API endpoints for querying subscriptions (/subscriptions), available services (/services), and a migration API for building the services set (/rebuildserviceset)
Allow for providing custom JSON payloads to ADM, APNS, and GCM
Add feedback to indicate whether a delivery point was modified on push (thanks Clemens Fischer)
Better connection pooling for the GCM implementation reduces memory footprint by about 90% for if(we)
Migrate Redis implementation to redis.v3
Automatically remove invalid PSPs if they are detected
