Gamification Engine:

- service implementation:
	- created the service setCustomizedGamificationPlugin for saving a new customizedBadgecollectionPlugin by using common infrastructure created before for the saving customized gamification plugins
	- created the service setCustomizedGamificationPlugin for saving a new customizedLeaderboardPointPlugin by using common infrastructure created before for the saving customized gamification plugins
	- refactored and improved the previous services and related infrastructures