work on adding comments to restaurant show page

Created CommentsController
change restaurant controller (prob was a no no)
Did some other things that simply did not work.  I'm tired. should rest and tackle this in the morning. 
Any good feedback would be welcome. 
In your controller, you reference `params[:restuarant_id]`.. If you want that parameter to actually exist, you'll need to nest your comment routes underneath the restaurant routes.