Pre 1.8 release

Added Gamemode Spectator
Preparing 1.8 changes

Added Spectator Gamemode
Pre 1.8 release

Added Spectator gamemode
Preparing 1.8 update 

Added Spectator gamemode
Preparing 1.8 update

Partially added Spectator gamemode
Preparing 1.8 update
Update World.h
Implementing Spectator Mode

Adding some proprieties of the spectator game mode in player.cpp :
- Players can't toss items
- Players can't touch the ground
Merge pull request #1437 from nesco/master

Implemented spectator gamemode.