Added permission node betterenderchest.user.insert. This note is granted automatically be default. If a player doesn't have this node, he/she will not be able to place items in a chest (but still take items).
Added more debug messages when the setting BetterEnderChest.showDebugMessages is set to true.
Added IllegalItems setting, that allows you to prevent players from inserting items with a certain id, name or lore (or a combination of those). The setting is documented here.