Facelift offline.html and use Bootstrap classes for "notifications"

Facelift offline.html and use Bootstrap classes for "notifications"

Update site_controller_test.rb

Update site_controller_test.rb

Remove whitespace

Reset Settings.status after test is done

Update test for offline page

Update site_controller.rb

Fix indentation

Update offline controller

Update offline.html.erb

Remove flash CSS classes and fix missed tests

Updated tests

Address most PR comments

Update _flash.html.erb

Update _flash.html.erb

Update edit.html.erb

Update offline.html.erb