v1.1.0

1. Create a new example app app and remove the old example
2. (Breaking change renderBack and renderFront are passing through props instenad of passing by childr
3. (new) Add a argument in onFlipEnd function, it will return a boolean value(1: front and 0 for back) when the flip animation end
4. (new) Add a new props: onFaceChanged function, it will retrun a boolean value(1: front and 0 for back) when the face is changed.