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'm not sure what's so wrong about it. Using the AirbrakeHandler you don't need to specify `exc_info` unless your `exc_info` is somehow different than what will be shown by `sys.exc_info()`