Blackrock Spire: Implements Leroy Jenkins achievement, by Spichy.

Fixes issue #1073.
Please, post your contribution following our coding style, otherwise I have to
waste a lot of time cleaning up the code

--HG--
branch : trunk

sql/updates/7797_world_scriptname.sql

@@ -0,0 +1,3 @@
+UPDATE `instance_template` SET `script`='instance_blackrock_spire' WHERE `map`=229; 
+UPDATE `creature_template` SET `ScriptName`='npc_rookey_whelp' WHERE entry=10161;
+UPDATE `gameobject_template` SET `ScriptName`='go_rookey_egg' WHERE entry=175124;