FEATURE: Import facebook avatars when logging in via facebook

FIX: warning about popup dimensions when using facebook login

Rules are:

- On account creation we always import
- If you already have an avatar uploaded, nothing is changed
- If you have no avatar uploaded, we upload from facebook on login
- If you have no avatar uploaded, we select facebook unless gravatar already selected

This also fixes SSO issues where on account creation accounts had missing avatar uploads

db/migrate/20160919003141_add_avatar_url_to_facebook_info.rb

@@ -0,0 +1,5 @@
+class AddAvatarUrlToFacebookInfo < ActiveRecord::Migration
+  def change
+    add_column :facebook_user_infos, :avatar_url, :string
+  end
+end