Creature Mod Tutorial 2 - "Spawning a Creature"

In this tutorial we're going to learn how to spawn an in game creature at the player's position.  We're doing this so that later on in future tutorials when we're creating our own creatures, we can easily test them in game.  Let's get started!

	* Step 1 - Writing a spawn function.
	We need to write ourselves a function which will spawn our creature.  I've chosen to spawn a 'Beefalo' but feel free to pick your own creature.  To see how this is done, check out the function 'SpawnCreature' found in 'modmain.lua'.

	* Step 2 - Triggering our function.
	Writing our spawn function isn't enough.  We need some way of telling the game to run our function.  Luckily for us, 'Don't Starve' let's us do that by calling 'AddSimPostInit'.  This function tells the game to run our function once the game has started and the player has spawned in the world.  By adding this call at the end of modmain.lua, we're telling the game to call 'SpawnCreature' once we've entered the game.

And that's it!  By enabling your mod in the main menu, you should now have a shiny new 'Beefalo' spawn right on top of you any time you jump into the game!