Developer credits
Git commits in Moodle 2.5.x by Oleg Sychev
commit 64ab5badbfbc156679c9b77bbd51eb6f07f22b68 Author: Oleg Sychev <oasychev@gmail.com> Date: Sat, 25 Jan 2014 07:41:01 +0800 Tag: v2.5.5 MDL-42456: add Mercurial vcs support to plugin_external_source
commit 14e5c999601f384c1ce5a168c0184d7372afc8cb Author: Oleg Sychev <oasychev@gmail.com> Date: Thu, 06 Jun 2013 01:58:26 +0800 Tag: v2.5.1 MDL-40013 Easier to override saving question hints