New: New event - column-sizing - fired when
New - event - column-sizing - fired when the column sizing chages

- This event allows plug-ins (specifically FixedColumns in this this
  case is what I'm thinking of, but others such as FixedHeader could
  also benefit) to alter their layout when the column sizing is changed
  (for example by a window resize).
New: CSS - Add .selected option to CSS for selected rows

- It is quite common to have a row selection styling in DataTables, so
  it makes sense to built this ability directly into the core CSS. It
  doesn't add too much extra weight, but it would be a huge pain for
  developers to do themselves and also it means I can reuse it in
  TableTools / Editor.
Dev - examples: Update to use `selected` class in the CSS