Renames confirmed_oauth_email to oauth_email

Refactors the way oauth_email is used to cover more cases (fixes pending specs)

db/migrate/20160126090634_rename_confirmed_oauth_email_to_oauth_email.rb

@@ -0,0 +1,5 @@
+class RenameConfirmedOauthEmailToOauthEmail < ActiveRecord::Migration
+  def change
+    rename_column :users, :confirmed_oauth_email, :oauth_email
+  end
+end