add passthru templates

If the body of the email is completely dynamic, there should be non need
to create an email template to dump it. As such add email views, and
layouts, to make it possible to _just_ pass body as a variable to the
enque system:

    $EmailQueue->enqueue(
		'recipient@example.com',
		array('body' => 'this is your email content'),
		array(
			'subject' => 'Email subject',
			'template' => 'EmailQueue.default',
			'layout' => 'EmailQueue.default'
		)
	)
allow specifying the email body as the second paramter

This is of relevance where the body is a (admin) user-provided string
document simple usage