Rake task to watch all logstash-plugins

For logstash lovers only :heart_eyes: 

Warning: due to octokit/octokit.rb#262, I needed to follow the steps describe here http://stackoverflow.com/a/5973759 to setup the SSL_CERT_FILE envvar before running the task
I don't know if it is Windows specific or how to integrate it correctly in the rake task, if someone could share a light on this