DuckDuckGo: Metadata does not actually work.
Reverse: Update metadata
DuckDuckGo.t: test example queries.

Also, add some commetns to give the file a bit of structure.
Reverse.t: delineate example query.
Merge pull request #753 from duckduckgo/jag/duckduckgo-meta

DuckDuckGo: Example query does not actually trigger the IA.
Merge pull request #754 from duckduckgo/jag/reverse-meta

Reverse: Update metadata