Adding a fix for a misplaced user signup success flash message
Adding extra code from Chapter 7's exercises
Adding sign-in-out changes before remember token generation
Adding authentication tests and code
Added bootstrap JavaScript for dropdown
Tests passing...
Adding final sign-in-out logic and tests.
Merge branch 'sign-in-out'

Conflicts:
	app/controllers/users_controller.rb
	spec/requests/user_pages_spec.rb