Create Pig.java

I made this file using @PEMapModder 's way.
Update EntityType.java in @PEMapModder 's way.
Create Enderman.java
Create Sheep.java
Create Silverfish.java
Create Skeleton.java
Create Creeper.java
Create Mooshroom.java
Create Cow.java
Create Wolf.java
Create Villager.java
Create Zombie.java
Create ZombiePig.java
Create Slime.java
Lol xD
Merge pull request #51 from jose-vm/patch-4

Complete Entities Files
Merge pull request #53 from PEMapModder/master

Fixed Moveable map not initialized; BlockType new conversion map fixing block ID 126
Bug fixes, read extended disc.
Added Spider.java (did'nt exist)
Fixed double to float conversion in StartGamePacket.java
Merge pull request #1 from BlockServerProject/master

update
Merge pull request #2 from MalekAlrwily/master

update