You can now spawn iron golems.

You can spawn them like in vanilla.
Some fixes (SEE DESC)

-Added missing mobs (wither, enderdragon and iron golem) to type to string list.
-Wither and iron golem can now spawn
Improved iron golem detection algorithm

- You need to make it like in vanilla
- Only used blocks are removed
Fixed a possible crash
Using parenthesis
Storing Y -1 and -2 blocks in a variable
Changed a little how detection works and added comments.
Fixed comments
Added myself to contributors
Using BLOCKTYPE instead of int
Implemented xoft suggestion
Fixed compilation
BLOCKTYPE...
Implemented xoft suggestion (partly)

I only get it working in first condition. It seems it's not compatible with else if...
(Hopefully) fixed if conditions
Merge branch 'fixes&features' of git://github.com/tonibm19/MCServer