Install and configure LoginToboggan on Drupal.org

As a part of user account creation improvements and #2386793: Modify user role progression on Drupal.org we are going to install LoginToboggan on Drupal.org. The main goal of doing this is to let new users log in immediately after they register.
This has been configured and tested on a dev site.

Deployment instructions

1. Merge the pull request on Bitbucket to add Login Toboggan to the make file.
2. Enable the logintoboggan module.
3. drush vset user_email_verification 0
4. Set the Welcome (no approval required) email:
   

   Welcome to the Drupal Community, [user:name]!
   You have an account, Now what?
   
   Please validate your email visiting this link: [user:validate-url]
   
   You can also add some details to your profile to tell the community who you are.
   
   
   ** Come for the software **
   
   Get started with Drupal: http://drupal.org/start
   
   Find a host for your website: http://drupal.org/hosting
   
   Learn more with professional training: http://drupal.org/training-services
   
   
   ** Stay for the Community **
   
   Meet our community http://drupal.org/community and the Drupal Association https://assoc.drupal.org
   
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Description

Here is an export of the settings from settings.local.php:

// Login using email address.
$conf['logintoboggan_login_with_email'] = TRUE;

// Use two e-mail fields on registration form.
$conf['logintoboggan_confirm_email_at_registration'] = TRUE;

// Set password.
$conf['logintoboggan_user_email_verification'] = FALSE;

// Automatically login.
$conf['logintoboggan_immediate_login_on_register'] = TRUE;

// Present a unified login/registration page.
$conf['logintoboggan_unified_login'] = FALSE;

// Non-authenticated role.
$conf['logintoboggan_pre_auth_role'] = variable_get('drupalorg_user_email_unverified_role');

$conf['logintoboggan_unified_login'] is left from prior experimentation with this setting, and can either be ignored or added as FALSE is the default value.