TopicResource renamed to QuestionResource as it will offer both, Topics
and Resources.
Introduced a Mapper that can deserialize a JSON String to JsonArray, but
the JSON-P implementation will not be found (yet)
Added infrastructure for MongoDB, but not used yet
Added external project mongo-jsonp that handles mapping, not used yet
Extended tests, so that all dependencies are added - solution works in Maven, but not in IntelliJ, because of "wrong" base directory when launching tests, need to look if there is a path configurable.