Hyphens break urls in CiviEvent confirmation email text

When you add custom confirmation text to an event email, hyphens in any urls 'sometimes' cause the url to only be hyperlinked up to the first part of the url before the hyphen.

First reported in 2011 by someone else on the civicrm.org forum:
http://forum.civicrm.org/index.php?topic=21535.0

Fix applied to pull request:
https://github.com/civicrm/civicrm-core/pull/2649