Improved exception handling.
Added on_exception signal.
IRC module disconnects on stop event.
IRC module deltatime increased to avoid to frequent reconnections.
Added Config.get_for_module.
Socket is always closed in the IRC module.
Added exception handling to BaseResponder.on_message_in and BaseModule.run.

Each module has got a logger property.
Module constructors pass config in a cleaner way.
Updated comments, removed redundant code.
Help command for BaseResponder can also send handler docstrings.
BaseResponder.respond will properly respond in a private message if the command
was sent in private.
Added load_json and save_json to helpers.
Used load_json in Config.
Changed the way modules are loaded to be able to throw an excetption easily.
Added parse_command wrapper.
Help command now uses that wrapper.
Added tell module.
Updated readme.