Joker-broker

* use `j.default` (package `joker`)

* remove `j.b.{model,logging,security}`
* rename `j.b.objective` to `j.b.base`
* rename `j.b.interfaces.rediz` to `j.b.interfaces.redis_`
* add `j.b.access.compute_hash`
* use `joker.space` (package `joker`)



History of joker-broker
=======================

* warns importing joker.broker.model
* DeclBase.representation_columns

* add DeclBase.find(), DeclBase.create_all_tables()

* RedisInterface.__repr__
* commit_or_rollback()

* RedisInterface.rekom_getsetx()