show the right way of adding a badge to a UISegmentedControl

In this pull request ... I've marked the right way and the wrong way of using a badge with a UISegmentedControl with your badge library. You don't have to put it into place that way, you can choose not to commit the few lines marked "wrong way" ... I only left it in place because my first reaction to a sample which seems to have extra lines (like the container view in "right way") is to optimize and remove them without realizing that there was a good reason to have them there. Guess I'm just protecting people like myself from making mistakes :)

I've also used a smaller font in badges just for the sake of smushing stuff together for demo.

I noticed that you made a change in your source recently from `UIExtendedEdgeNone` to `UIRectEdgeNone` ... can you tell me what that was about?