corrected use of nineoldandroid animate() because it can't be used in a
static way (because the android ViewPropertyAnimator will be used then).
This is a fix concerning backwards compability.
making corrections to the last commit and add check for empty stacklist
in addCardToLastStack() to avoid arrayoutofboundsexception. Will use
addCard() if stacklist is empty (and therefor create a new stack)
Merge pull request #6 from Aeefire/master

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