Enhance the config by supporting height_outer

[Robert Flaherty]

The height being treated as the content height instead of the UI height was unexpected, and seemed like a bug until I found the doc. The name could be anything, but height_xxx would appear in the docs together and jump out to the user. If both are specified, who wins I don't think matters.

[Jakub Ś]

This is something possible to implement but the ammount of work needed to implement this surpasses the result. Please rememebr that it is also possile to resize the editor:http://docs.ckeditor.com/#!/api/CKEDITOR.config-cfg-resize_dir, ​http://docs.ckeditor.com/#!/api/CKEDITOR.config-cfg-resize_enabled. When you shrink editor width, toolbar height grows as button are not hidden. This would create large ammount of wierd cases to handle. We don't really want to get in to all of that. Providing a feature which works on under certain configuration is only semi-solution which won't satisfy everyone. We don't won't go down that road as well.