S3 class for article objects
article.RdCreate or convert input into an s3 article object
Details
if the article is not parsable, article() will
print an error message and return a unparsed blob. This ensures that
information is not lost even if some articles have parsing errors.
Usually the best way to use as_article() is to have your working directory set to the
admin repo, and refer to articles by their id. See the examples section.