swcarpentry/lesson-template — pull request #86 by abought (2014-12-21 03:57:54+00:00)
Title: Improve logging of YAML header errors

Improve logging based on review of swcarpentry/matlab-novice-inflammation/#4 testcase.

Specifically, if the sample file is missing some fields from the YAML header section, those fields should be explicitly named in an error message.

Additionally: If custom tests are added to the base validator, they should run last. That way common error messages appear in a more logical and predictable order.