ansible/ansible — pull request #2686 by chamill (2013-04-15 13:28:40+00:00)
Title: Allow '.yml'/'.yaml' extension on group_vars files.

Look for a file with the base name of the group/host, first without
a file extension, then with a '.yml' extension, and, finally, with
a '.yaml' extension, loading vars from only the first one found.