OreBroadcast

• Blocks moved by pistons don't get broadcasted twice
• Use SafeBlock everywhere (could help reduce memory usage)
• Don't broadcast blocks if the event has been cancelled by another plugin
• Don't broadcast blocks placed by a player next to a natural vein
• Add '/ob optout' command to allow user to set if they want to receive the messages or not
• Add '/ob help' command displaying the commands you have access to and their description
• All the internal refactoringz

Github diff: https://github.com/bendem/OreBroadcast/compare/274ba12afa15d183139bdd51b84bd687ef808dcd...99f4dd0

• ob.receive permission is broken (Fixed in ebca4a0).
• Leftover debugs appears in the console when moving blocks with pistons (Fixed in d6e1297).