Move common views to partial

app/views/devise/shared/_openid_links.html.haml

@@ -0,0 +1,7 @@
+.text-center
+  .btn-group.btn-group-lg
+    - omniauth_configured.each do |provider|
+      = link_to user_omniauth_authorize_path(provider), class: "btn btn-success btn-lg",
+                                                        id: "omniauth-#{provider}",
+                                                        title: "Your #{provider} login" do
+        %i{:class => "fa fa-#{provider}"}