In search results list and details page, indicate format type. This

In search results list and details page, indicate format type.  This
required moving the search formats out of a simple string resource and
into a JSON resource, so we could distinguish between:
* spinner label, e.g. "All Books"
* item label, e.g. "Book"
* search format text, e.g. "book"

Incremented minimum android version to Gingerbread(8) so I could use
String.isEmpty