Made respondToSwipe method open and only requiring a direction.

The reason is that we might want to call it programatically, for example when pressing a button.

Change default implementatino of isUndoable to true

Add unlimited undo functionality

Update version to fix custom size support

Added support for any custom card size

Readded code to handle rapid swicks

At the moment we only support this when horizontal swipes is the only swipe direction allowed.

Add documentation and commentsto relevant methods and the example pro…

…ject.