Update Scalar-List-Utils to CPAN version 1.29

  [DELTA]

1.29 -- Thu Aug 01 13:40 UTC 2013

  * Bugfix to pairmap/pairgrep when stack moves beneath them during operation

1.28 -- Thu Aug 01 12:19 UTC 2013
  -- BROKEN; do not use. See 1.29

  * Added pairgrep, pairmap, pairs (inspired by List::Pairwise)
  * Added pairkeys and pairvalues