Perform APNs error handling asynchronously. Fixes #7.
Deprecate check_for_errors.
Use rbx-2
Fix specs
More fixes.
Increase timeout.
Default sound to 'default'.
Default alert in Redis to a string
Remove some deprecates reflections.
Revert "Default alert in Redis to a string"

This reverts commit e1dae71224796e27b3e24664f75a410c15f82ebb.
Use rpush-redis
Fix specs for Redis.
Remove some dead code.
Add functional spec for new apps.
Add apns_feedback_enabled option