allow declaring search renderer in keywords

[Kyle Nitzsche]

Keywords don't currently support optional declaration of a renderer to use when searching and should do so.

[Kyle Nitzsche (knitzsche)]

fixed with vivid-trunk rev 107 tag 1.4.12.

Can set by reference to common_template like so:
         {
            "keyword":
            {
                "keyword": "headlines",
                "department": "dept-headlines",
                "shared_category": "true",
                "_shared_category_title": "",
                "first_result_renderer_common_id": "news-first",
                "category_renderer_common_id": "news",
                "search_renderer_common_id": "news-search"
            }
         },

Or define in the keyword with "search_renderer"