Add reCAPTCHA to the account creation form

Created by: whunter

Add reCAPTCHA to the account creation form so we don't end up with a bunch of evil robots in our user table.

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JIRA Ticket: (https://webapps.es.vt.edu/jira/browse/LIBTD-1446) ()

What does this Pull Request do? ()

• Adds recaptcha gem.
• Uses it to populate the registration form with a recaptcha thingy.
• Then validates the response in the registrations controller

What's the changes? ()

• Adds recaptcha gem.
• Uses it to populate the registration form with a recaptcha thingy.
• Then validates the response in the registrations controller

How should this be tested?

• Put site_key and secret_key (new) in site_secrets.yml before provisioning. I'll provide those values to you.
• Make sure that you can successfully register a user account if you do click the captcha thingy.
• Make sure that there is an error message and no account is created if you DON'T click the captcha thingy.

Additional Notes:

• compel application branch: captcha_acct_creation
• Installscripts branch: captcha_acct_creation

Interested parties

@tingtingjh

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