module Tango
  module Fetch

    def fetch(url)
      shell("wget", "--progress=bar:force", "--continue", url)
    end

  end
end

module Tango
  module Fetch

    def fetch(url)
      shell("curl", "-O", "-C", "-", "--progress-bar", url)
    end

  end
end

Use curl rather than wget.
Use curl rather than wget.

It's on both OS X and Ubuntu boxes by default.
