V1.1.0 updates

Some long needed updates. Improves usability and leverages more of the datapoints available through the airbrake error reporting API. Includes a helper for fetching a logger object, pre-configured with an AirbrakeHandler, and many other improvements.

Updated [the README](https://github.com/samstav/airbrake-python/blob/v1.1.0/README.md) to reflect the simplified interface.
I understand, but now that is the only example in the README and it is misleading, because it recommends wrong thing. Can we at least replace it with:

    logger.exception("bad math", exc_info=exc)

?