Enable Open Food Facts contribution

[teolemon]

Open Food Facts is a free, open and collaborative database of food products from the entire world.
We are under OdBL, and we have a read/write API for photos and data.
It would be great to let users add missing products to Open Food Facts.

[teolemon]

http://world.openfoodfacts.org/
http://world.openfoodfacts.org/data