Added transfer command (/shopkeeper transfer playername, while looking at a shopkeeper chest) and shopkeeper.transfer permission node
Added setforhire command (/shopkeeper setforhire, while looking at a shopkeeper chest and holding the cost in hand) and shopkeeper.setforhire and shopkeeper.hire permission nodes
Added max-shops-perm-options option and associated shopkeeper.maxshops.X permission node
Added name-regex and msg-name-invalid options
Added creeper shops (options: enable-creeper-shops and msg-selected-creeper-shop; permission: shopkeeper.creeper)
