Defer loading the card image/audio until needed.
Load media element before animating the card.
Fixed issue with flip mode.
Modify lazy load to load the media for a couple cards at once. Also updated to auto play each card.
Refactored and fixed issue with shuffling.
Preload the next set of cards.
Slide should pause audio that is still playing from previous card.
Removed audio autoplay from this branch because it is buggy and out of scope.
Merge pull request #114 from Harvard-ATG/feature/lazy-load-card-media

Feature/lazy load card media