PvPstats: improved DB structure
Merge pull request #57 from ShinDarth/tw_Improved_PvPstats_db_struct

PvPstats: improved DB structure
Merge branch 'master' of https://github.com/TrueWoW/TrinityCore into ghbb

Conflicts:
	sql/tw_sql/TW_2014_08_11_00_characters_pvpstats.sql
	src/server/game/Battlegrounds/Battleground.cpp