Add Honeypot Captcha Branch

[iloveitaly]

Captchas generally create a bad UX and create another barrier to completion for the user.

I've been using the honeypot-captcha for all forms on my spree site it has worked great – blocking nearly all spam bots and removing the need for any captcha from the users' POV.

This approach will not work for everybody, but it might be good to provide a branch on the master repo with a version of the extension that uses honeypot-captcha instead of the standard spree_email_to_friend captcha system.

Thoughts?

[JDutil]

I'm going to close this issue due to it being a duplicate of #20 and I do think it would be worthwhile to have a solution for this. I've recently been working with rack-honeypot to add honeypot support to spree_contact_us, and think that could be a good solution if my patch is accepted upstream into the rack-honeypot gem.