Backwardscompability fix (nineoldandroids animate()),  .setSwipeable() 

*Backwardscompability fix (nineoldandroids animate()),
*CardUI.setSwipeable() now has effect after refresh() (changed in StackAdapter) [could also be done with notifyDatasetChanged in StackAdapter.setSwipeable() but this could lead to unwanted "refresh()" s...
* added check if stacklist of CardUI is empty in addCardToLastStack to avoid nullpointerexception - use addCard() if it is empty. Don't know if this is wanted, but if not - maybe introduce something like CardUI.getStackCount() ?