Jetpack: SSO: Added ability to turn off login form and require two factor enabled logins
  
Two new settings have been created in Settings > General > Single Sign On. One to turn off
the display of the login form and another to require that users have two factor enabled
on their WordPress.com account prior to logging into the site.


git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@820765 b8457f37-d9ea-0310-8a92-e5e31aec5664