Add User.rb to .gitignore
Added blueprint css style for ie, and sign up button styled big,green clickable ;), this changes ranges from 5.1.1 to 5.1.2 )
Added 3 partials for stylesheets, header and footer inclusion inside application.html.erb and tuned custom.css [ 5.1.3 ]
Added integration test for nav menu links [5.2.2]
Tuneamos config/routes.rb para generar named routes y se modifican los path del helper link_to en _header y_footer para usar los  named routes generados [5.2.3]
Finished layouts and routes [Chapter 5]