Water movment.

The player can now swim Mario-style underwater. He only drowns if his head is underwater, and he can only jump out of the water if his head is above water.
Merge branch 'master' of github.com:cstack/death-game
Water drag.
Merge branch 'master' of github.com:cstack/death-game

Conflicts:
	UnityProject/Assets/Prefabs/Player.prefab
	UnityProject/Assets/Scripts/Character/Player/GUIControl.cs