several changes

cardContainer.js
-change "return this" to "return div"

cardHolder.js
-checkColliders now verify wheather the card is already in a place
holder
-create fuction => res.add() complety renew (work in progress)

deck.html
-"holder.create" modified to satify new holder construcor method
Merge pull request #3 from gastonci/rebranch

several changes