Investigate swipeleft to delete (or to expose delete button)

[mshwery]

1. swiperight to complete > swipeleft to undo > swipeleft again to delete (or expose delete button)
2. on an uncompleted item: swipeleft to delete (or expose delete button)

Basically the swipe only shows delete if it isn't complete. If it's complete you have to undo it to delete it... is that good? Good enough for now.