Fix lingering Python2 issues in the management command
Update+expand ReadMe/example configuration

While the full documentation needs updating and expansion, the deployment section of the read me has been filled in with better recommendations for how to deploy the app. The config keys were also using the old, non-prefixed names.
Default to an HTTP 500 error for non-HTTP exceptions

Something about an error handler erroring out...
Release v0.8.1

Fix errors causing the error handler to raise an exception, and improved
Python2 support.