Allow tap to dismiss the picker via cancel

This is an iOS 7 default.

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Add better buttons for iOS 7

The segmented controls stick out like sore thumbs.

This could be cleaned up, but it's a fine stopgap.

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
No need to retrieve the picker view we have reference to

Signed-off-by: Stephen Celis <stephen@stephencelis.com>