[keycloak-dev] Registration flow, Form SPI, and Recaptcha Support

[Bill Burke]

Added registration flow.  As part of this a new Form SPI was created. 
This Form SPI should only be used when you have a form that has optional 
parts.  For example, a form might have password and otp on it, but you 
don't want to process otp unless it is enabled.

The registration flow now has a Recaptcha option that is disabled by 
default.  I don't know why, but I had trouble getting this to work all 
the time on Firefox.

To enable Recaptcha you do have to muck with our Security Defenses 
headers i.e. Content-Security-Policy.  All this is documented in docbook.
-- 
Bill Burke
JBoss, a division of Red Hat
http://bill.burkecentral.com