Init de la partie steamCmd
Update install.sh.twig

correction de léger bug sur la partie install
Update AddSteamServerType.php
Ajout des donnees relatives a steamcmd au fixtures.
Maj des dependances.
Merge branch 'steam-cmd'

Conflicts:
	src/DP/Core/MachineBundle/Entity/Machine.php
	src/DP/GameServer/GameServerBundle/Entity/GameServer.php
	src/DP/GameServer/SteamServerBundle/Entity/SteamServer.php
	src/DP/GameServer/SteamServerBundle/Form/AddSteamServerType.php
	src/DP/GameServer/SteamServerBundle/Resources/views/sh/install.sh.twig