Log Message:
Update to 1.57

Upstream changes:
1.57    2013-03-02

- This release is based on version 2013a of the Olson database. This release
  includes contemporary changes for Chile as well as several new zones -
  Asia/Khandyga, Asia/Ust-Nera, and Europe/Busingen. It also includes a number
  of historical changes.