added a little crappy nav bar thing
tidying of administrative actions in the newsletter index page
fixed Book Model and added Tag Model.
removed all the gross SQL in the controller because now it's all handled by the Model :)
added permission for action=>tag
added delete function to Newsletter controller
added validation for Newsletter model.
fixed slight problem with navbar where clicking on a function wouldn't go back to the index action, removed cakephp icon from layout because i'm a terrible person
renamed Library to Book a bit ago -- just fixin' the View/ folder.
Newsletter delete action view. not sure if needed
added 'link' to newsletter add form.
Added description of PLG to homepage, replacing Cake's normal diagnostics page.