Replaced all but one Mix.shell.cmd call with System.cmd. The remaining call is for windows systems using powershell and I don't know the appropriate token parsing for powershell command lines.
Replaced all but one Mix.shell.cmd call with System.cmd. The remaining call is
for windows systems using powershell and I don't know the appropriate token
parsing for powershell command lines.

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