@drees: added 3 methods addConsumable, removeConsumable and clearStomach
this methods will only add or remove an Item from the stomach-list and
clear will remove all. u have to controll if an item has the slot
'stomach' so it will be redirector to stomach
use toStomach to get an boolean if u have to clear the stomach or if u
can add one more item, okay?

also hope that this commit will fix the jdom-problem.