DB/Quest: Added data for all Mists of Pandaria quests up to patch 5.4.7.
Core/Quest: Load RewardPackageItemId from DB.

Core/PacketIO: Small update to SMSG_QUEST_QUERY_RESPONSE structure.
Core/PacketIO: Update SMSG_QUESTUPDATE_ADD_KILL structure and opcode.
Core/PacketIO: Updated SMSG_EXPLORATION_EXPERIENCE opcode.
Merge branch 'skyfireMoP'