flip doesn't work in IE 11

[joeylu]

i understand that this plugin never tested in IE, however, it would be cool if the flip works, cause everything else are working under IE, except that you can never see the "back" side.

also, the modal card's height is bound to the front side, if the back side has more contents than the front side, it will sneak out from the stack.
would be great if the height can be auto-adjusted

btw, great work!