Add transition animations for iOS

[rekola]

For dialogs mostly. You should be able to specify a direction from where the dialog or view animates from.

[rekola]

Also show the animation for the FrameLayoutView created in the method showPicker. This functionality can be tested in the example application by opening the dialog using the "Click me!" button, and pressing the button that is labeled "Option 1".

[sakrra]

Done

[rekola]

• For showPicker, the transition should be from right to left.
• All transitions should be similar to those in iOS Settings: There should not be any spring action - the view should just be quickly eased to the correct position.
• Dialogs should also be transitioned out of the screen when they are closed.
• Transitions are also needed for the case when user moves from one full screen view to another. Currently that case is handled by calling setVisibility method for the old and new view, but a new method switchViews should be added for this case.
• If possible, the switchViews transition should also animate the old screen like iOS Settings does, because it looks cool.