Core/Player: All spells and skills are now automatically learned without any need for external data

* Fixes learning mail/plate at level 40 for shamans/warriors/paladins
* Fixes learning riding for worgen/paladins/warlocks at level 20

sql/updates/world/2015_03_07_03_world.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS `playercreateinfo_skills`;