[svn] Add Unit::GetObjectInWorld function to get object by guid without providing reference.

Small change in SummonGameObject.
Fix a bug that player can not click summoned najentus spine (must let target summon gameobject).

--HG--
branch : trunk

src/game/Unit.h

@@ -1218,6 +1218,10 @@ class TRINITY_DLL_SPEC Unit : public WorldObject
         void addFollower(FollowerReference* pRef) { m_FollowingRefManager.insertFirst(pRef); }
         void removeFollower(FollowerReference* /*pRef*/ ) { /* nothing to do yet */ }
         static Unit* GetUnit(WorldObject& object, uint64 guid);
+        template<class T> static T* GetObjectInWorld(uint64 guid, T* /*fake*/)
+        {
+            return ObjectAccessor::GetObjectInWorld(uint64 guid, T* /*fake*/)
+        }
 
         MotionMaster* GetMotionMaster() { return &i_motionMaster; }