updating rails, bootstrap3
preliminary fixes for navbar
fixing twbs customisations, navbar
fix menu css
adding role navigation to navbar
fixing intranet navbar
fixing flash messages
fixing footer
fixing new session form
enlarge body top padding
fixing home page
fix breadcrumb
fix page form, extracting form errors, fix ckeditor
fix etudes list
fix etudes pages
fix pages#show view
fix etudes buttons
fix documents#index view
fix documents form