Adds a delete_button helper for resources.

Now deletes are proper DELETE requests without the need of javascript. Thats very helpful for tests.
Updates jquery to 1.11.0
Autofocus the cancel button in confirm dialogs.
Fixes the logout button.
Fixes confirm notice if toggling an dirty element.
Animates preview frame and element panel resizing.
Bump version to 3.0.0.rc4
Store current confirm dialog as currentDialog, so it can be closed globally. Fixes #465
Proper name spacing for module includes. Refs #462
Revert to the consistent behaviour we had before 0080bf4681d652681045a8cf5f74a80bf6392198.

Even a logged in user should not be able to visit an non public page. For further reference please see https://github.com/magiclabs/alchemy_cms/issues/463

Refs #463
Fixes Userstamp include
Fixes some icons.