* Added more database functions.
Added ability to check if a uniqueId exists without creating it - used
to check if a player is known or not.
Added join/quit listener.
* Hooked in grid database to track where islands are.
Added Nether events and portal function.
Added default /island command operation.
* Added protection for islands.
* Updated license to BSD license.
* Removed unused imports.
Added configs.
* Added more protection listeners.
Flying mobs, visitor protection
Worked on PluginConfig.loadPluginConfig(). Changed the NotSetup
processing : when loading config, it will store errors and if there are,
it will run the plugin as "NotSetup" and send to users what is wrong and
why. Major parts are still remaining as it is a "preview" of an
unfinished and "waiting-for-improvements" work.
