New: Smart filtering upgraded to support quoted exact match

- DataTables' smart filtering now has the ability to search for an exact
  string, in the given order, over multiple words. This is done by
  providing the exact match search string in quotes - for example:

    Angela "Cheif Exec" London

  Will match three terms - `Angela`, `Cheif Exec` and `London`. Those
  three terms will be matched in any order.

- This matches the search behaviour that we all know and love in Google!

- It can be disabled along with the rest of DataTables' smart filtering
  using the `smart` option.

- This enhancement comes courtesy of Barry Keepence. Original forum
  thread: http://datatables.net/forums/discussion/16250/. Thanks!