Set omniauth_crowd version constraint to 2.3.0

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Update omniauth_crowd dependency's version constraint from ~>2.2.0 to ~>2.3.0.

Version 2.3.0 of omniauth_crowd has better support for sessions and makes it possible to use external SSO site to login.

Additional request: Gitlab no longer seems to use the login form rendering done by omniauth modules but instead uses it's own HTML template (/opt/gitlab/embedded/service/gitlab-rails/app/views/devise/sessions/_new_crowd.html.haml). Are you planning to support custom login elements without changing files that would be overwritten by an update from the software repositories?