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.
You are right. Let's pass `record` to the `Airbrake.log` and do all the work there. I want to have functions like `airbrake_error_from_record` and `airbrake_error_from_exception` because then we can easily write tests for them testings different records and exceptions.