Core/Guilds: Implemented basic guild leveling (no player statistics/reputation)

sql/updates/characters/2012_09_07_00_characters_guild_434.sql

@@ -0,0 +1,3 @@
+ALTER TABLE guild ADD `level` INT(10) unsigned DEFAULT '1' AFTER `BankMoney`;
+ALTER TABLE guild ADD `experience` BIGINT(20) unsigned DEFAULT '0' AFTER `level`;
+ALTER TABLE guild ADD `todayExperience` BIGINT(20) unsigned DEFAULT '0' AFTER `experience`;