Add 2 RESTful service methods.

Finds all Geo Objects categorized by the specified category:
{{{
List<RelatedTopic> getGeoObjectsByCategory(long categoryId)

GET /site/category/{id}/objects
}}}

Finds all categories that match the search term (case-insensitive substring search)
and returns all geo objects of those categories, grouped by category:
{{{
SearchResult searchGeoObjects(String searchTerm)

GET /site/geoobject?search=<search term>
}}}