This is a world I put together of all mob spawners in minecraft.I just thought it might be useful to other people so they don't have to use a editing tool. The mobs included are:

1. Bat
   
2. Chicken
   
3. Cow
   
4. Mooshroom
   
5. Pig
   
6. Sheep
   
7. Squid
   
8. Villager
   
9. Enderman
   
10. Zombie Pigman
    
11. Blaze
    
12. Creeper
    
13. Ghast
    
14. Silverfish
    
15. Skeleton
    
16. Wither
    
17. Slime
    
18. Magma Cube
    
19. Spider
    
20. Cave Spider
    
21. Witch
    
22. Zombie
    
23. Giant Zombie
    
24. Ocelot
    
25. Wolf
    
26. Angry Wolf
    
27. Iron Golem
    
28. Snow Golem
    
29. Falling Sand
    
30. Primed TNT
    
31. Falling Anvil
    
32. Boat
    
33. Minecart
    
34. Experience Orb
    
35. Firework
    

Additional Notes

All spawners, except the firework, have been changed to only spawn when you are in a 5 block radius instead of 16. This is so that all spawners are not going all at once. The firework spawner has a increased spawn rate and spawns all types of fireworks. It will spawn when you are in a 16 block radius.