search results export as CSV

[wshayes]

Please provide a CSV export of the search results such that a user can access the search link with the CSV export parameter and get a downloaded CSV file (or have it automatically open in Excel if their browser settings support that).

How to format the CSV results should be coordinated with users. Please feel free to engage @kmccann in this process.

This will be used to provide an export option for the search results page.