Ensure we are logging the serialized args.
Merge pull request #54 from larrylv/log-serialized-args

Ensure we are logging the serialized args.
Don't deserialize parameters in individual adapters.

It's not their responsibility and this makes logging (and rescuing from errors, eventually!) a lot easier.
Rename Adapter.queue and .queue_at to .enqueue and .enqueue_at for consistency.