changes from week 3 class: added controller actions for managing users
Created working hyperlinks on post page; changed home to posts#index; added a vote item to posts page; added twitter bootstrap formatting
Merge branches 'after_class_4' and 'master' into after_class_4

Conflicts:
	app/controllers/users_controller.rb
	app/models/user.rb
	app/views/users/_form.html.erb
	app/views/users/new.html.erb
	config/routes.rb
office hours