Adding a call to describe the data fields for a given article that can be used in a template.

Signed-off-by: Rob Dobson <rob@rdobson.co.uk>
Adding a button to the update page for an article in order to reveal the data source/attribute names for a given article.

Signed-off-by: Rob Dobson <rob@rdobson.co.uk>
Merge pull request #6 from rdobson/show_info

Add ability to display the data used to populate an article