… shutdown, SIGQUIT = graceful shutdown (let worker finish current job)

… I like how the argument are done, but it works for now.

_delay can be either a relative delta from now (e.g. 10 == 10 seconds from now) or an absolute timestamp.
_max_retries is how many times the job is retried (with an ever increasing delay) until the job is deleted as failed

For the non-forked dispatching copy.deepcopy is now used to avoid accidently modifying the arguments.

…d changed to compressed json as it drastically cuts down on storage. Since Redis is all in memory it's even more important.

Unfortunately, redis-py tries to decode everything by default which means
you can't store binary. I added a patch to it to allow a subclass to override
the encoder/decoder (http://github.com/samuel/redis-py). You now you'll
need to use that version until the official release has similar support.

…ject that has methods dumps and loads.

…t's found doesn't support binary values.