Make Hydra Rake task safer and more useful

hydra.yml

<% require 'facter' %>
<% Facter.loadfacts %>
workers:
  - type: local
    runners: <%= Facter.sp_number_processors %>

Rakefile

begin
  require 'hydra'
  require 'hydra/tasks'

  if ENV['RAILS_ENV'] == 'test'
    Hydra::TestTask.new('hydra:spec') do |t|
      t.add_files 'spec/**/*_spec.rb'
    end
  else
    puts "No Hydra task unless you're running with RAILS_ENV=test"
  end

  Hydra::SyncTask.new('hydra:sync')
  Hydra::RemoteTask.new('bundle', 'bundle')
rescue LoadError
  warn "$! - hydra not loaded"
end

desc "Actually run Hydra in the test environment"
task "hydra:spec:run" do
  system %{rake RAILS_ENV=test hydra:spec}
  raise StandardError.new("Hydra failed") if ($?.exitstatus != 0)
end