Added cloudflare action

This ruleset was created based on information found at http://www.normyee.net/blog/2012/02/02/adding-cloudflare-support-to-fail2ban/

I have simplified it down to a single action file with broken out configuration options:

cftoken is your Cloudflare API key which can be found by going to https://www.cloudflare.com/my-account and logging in. Toward the bottom should be your API key.

cfuser is the email address you use to login to Cloudflare
why this html escaping of ```<``` and ```>``` in the comments?