do threading in the correct twisted way.
Allow !tell to be directed at multiple users.
Rejoin channels.
Allow dash in simple karma words.
Make sure karma words don't start in the middle of a word.
Block karma floods.
Strip control characters out of karma items.
Merge branch 'feature/karma-improvements' into dev
Import tfail plugin from old bot.
Improve text handling in Url plugin.
bump version
Merge branch 'release/1.4' into dev