will_paginate:install Sake task

# gem install sake
# sake -i http://pastie.org/161203.txt

desc %[Install the plugin in vendor/plugins/will_paginate]
task 'will_paginate:install' do
  require 'fileutils'
  wp_dir = 'vendor/plugins/will_paginate'
  begin
    FileUtils.mkdir wp_dir
  rescue Errno::EEXIST
    $stderr.puts "#{wp_dir} already exists: updating ..."
  end
  url = 'http://github.com/mislav/will_paginate/tarball/master'
  system %{wget -nv #{url} -O- | tar xzv -C #{wp_dir} --strip 1}
end