Merge branch 'SAML_1888' into 'master'

Add SAML to list of social_provider

Resolves issue 1888.  Still an issue because the SAML link under Connected Accounts will not have a logo.

See merge request !891

app/helpers/oauth_helper.rb

@@ -13,7 +13,7 @@ module OauthHelper
   def enabled_social_providers
     enabled_oauth_providers.select do |name|
-      [:twitter, :gitlab, :github, :bitbucket, :google_oauth2].include?(name.to_sym)
+      [:saml, :twitter, :gitlab, :github, :bitbucket, :google_oauth2].include?(name.to_sym)
     end
   end