Need an error handling concept added to the syllabus

http://forum.exercism.org/t/how-to-do-errors-in-series/7532

And pull in the new `halt*` features from 1.7

Start by reading the linked Exercism forum discussion about errors in the series and identify the syllabus location for related concepts. Then review the jq 1.7 halt* features and the existing syllabus structure; done means the error-handling concept and those features are incorporated consistently.

Written by the indexing model from the issue text.