Fixed pluralizatoin of 'users' in index.html of admin view.
Replaced create and destroy tests with login and fail_login tests in sessions_controller)test.rb
Updated test fixtures in test/fixtures/users.yml to match those in sessions controller test
Added a before filter to call authorize method that redirects to login if user is not in session
Added 'skip_before_filter' to all controllers except admin.
Removed extraneous '/' and 'user./' from views/users/show.html.erb.