Finished chapter 11 exercises, all but #3, which involved refactoring on home page, user show page, and following/followers page, and seemed to work but caused breakages in the test suite which I couldn't easily locate.  Besides that added a test for destroying relationships associated with a given user, provided a respond_with method in the relationships controller in order to refactor the code and make it cleaner using respond_to at the top, and then wrote test for the stats on the profile page