pubsub task to notify to Hub server.

Rakefile

desc "notify to PuSH Hub server"
task :pubsub do
  require 'net/http'
  require 'uri'

  hub_url = "http://satooshi.superfeedr.com" # <--- replace this with your hub
  atom_url = "http://blog.satooshi.jp/atom.xml" # <--- replace this with your full feed url
  resp, data = Net::HTTP.post_form(URI.parse(hub_url),
      {'hub.mode' => 'publish',
      'hub.url' => atom_url})
  raise "!! Hub notification error: #{resp.code} #{resp.msg}, #{data}" unless resp.code == "204"
  puts "## Notified hub (" + hub_url + ") that feed #{atom_url} has been updated"
end