Dictator

Things with added
* transparent calls of Redis commands if no such argument in Dictator

Things we added:
* `.lock()` – to create and return `redis.lock.Lock` object for current connection to Redis
* `.copy()` – return dict object made from Dictator'ss data
* raise `KeyError` if key you are trying to get doesn't exist in Redis.
* more logging calls for better debug.

Things we improved:
* Readme typos and deprecated methods.

Temprorary removed KeyError from `.pop()` method to produce `None` instead of exception when key doesn't exist.

* Add KeyError to` __getitem__` and `pop` methods.
* Fixed `get` method to be more accurate with non-existing keys.

Integrated with Travis CS