La librairie javascript modernizr a été ajoutée

Gemfile

@@ -42,6 +42,7 @@ end
 
 gem 'haml-rails'
 gem 'compass-rails', '1.1.3'
+gem 'modernizr-rails'
 gem 'activeadmin', github: 'gregbell/active_admin'
 gem 'rails-i18n'
 gem 'devise-i18n'

Gemfile.lock

@@ -160,6 +160,7 @@ GEM
     method_source (0.8.2)
     mime-types (1.25.1)
     minitest (4.7.5)
+    modernizr-rails (2.7.1)
     multi_json (1.9.0)
     mysql2 (0.3.15)
     nio4r (1.0.0)
@@ -258,6 +259,7 @@ DEPENDENCIES
   jbuilder
   jquery-rails
   jquery-turbolinks
+  modernizr-rails
   mysql2
   quiet_assets
   rails

app/assets/javascripts/application.js

@@ -14,4 +14,5 @@
 //= require jquery_ujs
 //= require jquery.turbolinks
 //= require turbolinks
+//= require modernizr
 //= require_tree .

app/views/layouts/application.html.haml

 !!! 5
 /[if IE]
-%html(lang="#{I18n.locale}")
+%html.no-js(lang="#{I18n.locale}")
   %head
     %title=t '.title'