Guard::Group

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A group of Guard plugins. There are two reasons why you want to group your
Guard plugins:

* You can start only certain groups from the command line by passing the
  `--group` option to `guard start`.
* Abort task execution chain on failure within a group with the
  `:halt_on_fail` option.

@example Group that aborts on failure

  group :frontend, halt_on_fail: true do
    guard 'coffeescript', input: 'spec/coffeescripts',
      output: 'spec/javascripts'
    guard 'jasmine-headless-webkit' do
      watch(%r{^spec/javascripts/(.*)\..*}) do |m|
      newest_js_file("spec/javascripts/#{m[1]}_spec")
    end
    end
  end

@see Guard::CLI
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