basic heroku "rake deploy" task

deploy.rake

namespace :deploy do
  task :default => [:production]

  desc "check if git is clean"
  task :check => "assets:check"  do
    unless system("git diff --exit-code")
      puts "Git not clean. Aborting."
      `growlnotify -m 'deployment failed'; say 'deployment failed'`
      abort
    end
  end

  desc "deploy code to production"
  task :production => :check do
    `git push heroku`
  end
end

task :deploy => ["deploy:production"]