New mob:riptooth and diplocaulus.

Diplocaulus:

• spawn in river and swamp.
• a breedable creature,can use fish to breed.
• drop his leather and meat.

Riptooth(heavy):

• a deadly shark.
• spawn in all ocean.
• It will bite the target tightly when attacking.
• very deadly and danger.

other change:

• use sneak+right-click can command flamehorn sitting or follow you.
• add new item about new mobs.
• Fixed some bugs.