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.
Agreed, that's a good idea for a refactor. That won't be too bad, I'll go ahead and do that. That makes a good place for me to put the logic I mentioned [here](https://github.com/airbrake/airbrake-python/pull/8#discussion_r14509428)