The Nexus, The Oculus: Boss drakos support, register needed scripts

This scripts are pushed for testing purposes, so is not recommended
opening it for production enviroments. any feedback is welcome :)
Fixes issue #449.

--HG--
branch : trunk

sql/updates/7646_world_scriptname.sql

@@ -0,0 +1,3 @@
+UPDATE `creature_template` SET `ScriptName`='boss_drakos' WHERE `entry`=27654;
+UPDATE `creature_template` SET `ScriptName`='npcs_oculus_drakes' WHERE `entry` IN (27657,27658,27659);
+UPDATE `instance_template` SET `script`='instance_oculus' WHERE `map`=578;