Updated README.
Updated README.

orionstein/deis-ghost,mmornati/docker-ghostblog,alfredkam/ghost,coolya/ghost,Invacio/docker-ghost,grieve/ghost,MaTeamBM/docker-ghostblog,mshirley/ghost,orionstein/docker-ghost,orionstein/deis-ghost,vitan/ghost,MaTeamBM/docker-ghostblog,elisescu/docker-ghost,joukou/joukou-docker-ghost,orionstein/docker-ghost,dockerfile/ghost,willhackett/ghost,zedtux/ghost