Point Of Interest (Quest Details etc.)

@wsuchy , @jacekjursza and me - decided to implement QuestDetails API and NearbyQuests API (+ all related stuff) in single brunch (because these tasks are strongly coupled).

At the moment - this pull request must be only reviewed and not merged!
Hmm.... But, at this point of code - we are working with Solr results. So, probably, it would be better to verify and unify representation data before storing it to Solr?