Add --umbrella option to 'mix new'
Add --umbrella option to 'mix new'

pedrosnk/elixir,antipax/elixir,elixir-lang/elixir,michalmuskala/elixir,kelvinst/elixir,kimshrier/elixir,pedrosnk/elixir,lexmag/elixir,beedub/elixir,lexmag/elixir,gfvcastro/elixir,beedub/elixir,gfvcastro/elixir,kimshrier/elixir,antipax/elixir,joshprice/elixir,kelvinst/elixir,ggcampinho/elixir,ggcampinho/elixir