Extract EE specific files/lines for app/views/layouts

We have the following files containing EE specific code. We should move them to ee/

• app/views/layouts/_mailer.html.haml
• app/views/layouts/_page.html.haml
• app/views/layouts/application.html.haml
• app/views/layouts/devise.html.haml
• app/views/layouts/mailer.text.erb
• app/views/layouts/notify.html.haml
• app/views/layouts/notify.text.erb