Palantir fixes

1) Both NerbyQuests and QuestsDetails API moved to Palantir controller
2) Changed response schema: 'location_x' -> 'latitude' abd 'location_y' -> 'longitude'
3) NearbyPOISearchService: perform search only inside current wikia
Parent class has getWikiId and setWikiId, maybe we could stick with one approach for consistency.