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* APNS, GCM: Add a db_index to the device_id field
* APNS: Use the native UUIDField on Django 1.8
* APNS: Fix timeout handling on Python 3
* APNS: Restore error checking on apns_send_bulk_message
* GCM: Expose the time_to_live argument in gcm_send_bulk_message
* GCM: Fix return value when gcm bulk is split in batches
* GCM: Improved error checking reliability
* GCM: Properly pass kwargs in GCMDeviceQuerySet.send_message()
* BUGFIX: Fix HexIntegerField for Django 1.3