Feature/now 240

This is an attempt to complete the NOW-240 -- wants widget and syndication functionality.
Lets keep the list. We decided to use a list too allow multiple configurations of a wants widget. Meaning, for a given product, there could be a Wants widget instance that has one set of buy reasons and then another Wants widget instance that has a different set of buy reasons. We should still pre-populate the list of buy-reasons associated with a product when on the Wants admin page.