Add '--quiet' option to 'mix deps.get'
Add '--quiet' option to 'mix deps.get'

Closes #1028.

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