* Make reverse proxy plugin use proxy.py core loop for async io operations
* Address lint errors
* Deprecate on_websocket_close and replace with on_client_connection_close
* Lint fixes
* Retry on SSLWantReadError and SSLWantWriteError
* Allow plugins to add custom command line flags. Addresses #301
* Reduce dependency over Flags class. This will be deprecated so that adhoc flags can be added without any additional manual configuration
* Fix: Argument 1 to "mock_default_args" of "TestMain" has incompatible type "Namespace"; expected "Mock"
* Reduce Flags class to just the initializer.
* Store list of action dest in FlagParser
* Add DEFAULT_HTTP_PORT constant
* Use DEFAULT_HTTP_PORT in tests
* Refactor into exception module
* Refactor into inspector module
* Refactor into server module
* Refactor into proxy module
Abhinav Singh