Fix: $().andSelf() was deprecated in jQuery 1.8

- As of jQuery 1.8 `andSelf` was deprecated in favour of `andBack`.
  `andBack` was not available in jQuery <1.8, and I don't want to make
  1.8 a requirement yet, so a small workaround requiring two unbind
  calls is used to avoid calling `andSelf` or `andBack`.