Merge pull request #8 from angrycodr/Move-sso-helper-functions-to-a-class

Moved the following helper functions from disqus.module to DisqusCommentManager : disqus_sso_disqus_settings(), disqus_sso_key_encode(), disqus_sso_user_data()
Merge branch '8.x-1.x' of https://github.com/angrycodr/disqus-for-drupal8 into 8.x-1.x