The biggest change of this update are the new possibilities of chat messages.
Now you can define regular chat messages, JSON chat messages, Hotbar messages, JSON Hotbar messages, Titles (+ Subtitles) and JSON Titles (+ Subtitles).
How? See here: Chat API Reference.
But this is not the only change! I also splitted the prior config.yml into several YAML files. Now you got config.yml (permission settings), messages.yml (ingame plugin messages) and blocks.yml (block messages).
Furthermore i completely redesigned the internal software architecture. It's now more structured and more stable.
The "prefix" function seems pretty useless to me, so i removed it.
At last now it contains statistics by MC Stats (http://mcstats.org/plugin/Block_Messages).