Update for 1.4

* Added an api for implementing persistence
* getActionDesires() and getMovementDesires() now returns a list of desire items so you can also get the priority
* Fixed npe when settings using custom max health in createentitycontext
* Fixed issues with copyInventory
* Changed desire constructors to also accept bukkit classes. You won't notice this right away because it will still work like the way it used to but with the addition that you can also pass in common bukkit classes.
* Enhanced entity spawning and respawning while loading/unloading chunks.
* Fixed createEntityFromExisting not setting up default desires
* Updated with (craft)bukkit