implement Fancy Variable Layout
add image assets
added images for cards
display ace of spade (no padding)
pass testCardViewWithBorderAndPadding
pass testRevealCards & testRevealAllButton
pass testAssignRandomCards
pass testAssignRandomPairs, testShuffleCards,
testShuffleWhenLayoutChanged
pass add testMatchSelectedPairs, testResetScoreAfterShuffle, testWinGame
move location of spec
make background of CardView white
Animate shuffling
Fix: hide cards after all ongoing shuffling animations had completed
Fix: layout changes animation problem