Support updating of atomic host
Support updating of atomic host

Resolves #75
br0ziliy/oh-my-vagrant,geekcheng/oh-my-vagrant,purpleidea/oh-my-vagrant,mairin/oh-my-vagrant,br0ziliy/oh-my-vagrant,purpleidea/oh-my-vagrant,LalatenduMohanty/oh-my-vagrant,LalatenduMohanty/oh-my-vagrant,mairin/oh-my-vagrant,geekcheng/oh-my-vagrant,mairin/oh-my-vagrant,geekcheng/oh-my-vagrant,br0ziliy/oh-my-vagrant,purpleidea/oh-my-vagrant,LalatenduMohanty/oh-my-vagrant