Touch of cleanup to Gunfighter's addition to exp
update /book description
Merge pull request #271 from necrodoom/patch-25

update /book description
Reduce chance of self repeating powertool actions.
Merge pull request #272 from GunfighterJ/2.9

/eco overhaul, adds /eco set
Negate 'groupmanager.noofflineperms' by default in the owner group.
Move firework meta handling into MetaItemStack
Allow firework meta to be applied to item spawning and kit commands.
Add example firework kit, and cleanup debug messages.
Cleanup /eco, fix reset broadcast