Add option to export as CSV file

[dartiss]

Have it generated at same time as cache refresh. Hints on how to do are here...

http://blog.calebnance.com/php/creating-a-csv-file-in-php.html

Add admin screen where last update timestamp can be viewed, link to download and option to refresh. Also add default cache option to screen.

New admin screen should be under Plugins menu.

[dartiss]

Probably best to add this to an existing admin screen as it can all fit on one line.

Also add shortcode to download CSV as well.

CSV will be generated upon request so need for a date - just a button.

Will drop cache option too.

[anitagraham]

Another alternative would be to export it as a json list suitable for composer.