updated changelog
Added bot statistics command

* Added message count and command count to json settings
* Added !botstats command to allow viewing of bot statistics
* Made settings.json file a blank default copy
* Added development setting file to gitignore
* Added kicked information to log
Added !feedback command

* users can now leave feedback directly with a bot command (limited to
once every 5 minutes)
added !broadcast command

* broadcast command allows users to send a message to every channel,
provided they include the broadcast_tag
* the broadcast_tag is required in the settings json file