Christiaan Hofman

set NSIsRelatedItemType for skimnotes document type

compare tokens by pointer equality

observe rich text token after loading window

remove only rich text token temporarily

observe and update rich text token

add some comments

update textviews before content is set by bindings

don't bind directly to file's owner, there still is a retain cycle remaining, probbably related to views not in the window. Also need to explicitly set the owner controller's content to nil after breaking its binding.