Bukkit

Fixed players being given books upon every login.
Fixed the "Welcome-Message" config value not being added automatically, causing the [BookRules] null message on login.
Added a config to change the delay in seconds before users are given the books, for compatibility with AuthMe, StarterKit, etc.
Added Metrics for anonymous plugin tracking. Opt-out by editing plugins/PluginMetrics/config.yml and change opt-out to true if you so wish.