Step 4.3

- Rectified a bug on the inspector when the user mouseout the item
before ajax loads the description that makes the inspector to not hide
properly.
- Spellbook client side is finished, the only thing remaining is the
handling on server side of spellbook changes.
- Added a new image that contains spells icons and renamed the image
that contains the items icons.
- ItemDragger and SpellDragger are inherited classes from Dragger.
- Now, when the server handler use sendPlayer, it sends all the datas in
one paquet.
- Spells can be queried on : http://hostname:8080/spell/spell_id and
supports JSONP by using parameter callback=yourcallbackname