Update Brazilian public bodies and add more columns

This updates data/br.csv with data from the Brazilian official source (SIORG) dated 2013-12-11 (last update) and brings data to more columns. Already uses the new schema.

Columns first filled in on this update:

* description (from either legal competency or purpose text, if available)
* classification (public body type)
* founding_date (not actually a founding date, as that information is not available. Rather it's the date of the latest legal norm with created or altered the public body organizational structure)
* tags (based on legal entity type, added here for lack of a proper field)