externalise jquery using jquery-raisl-cdn and jquery-rails fallback

Gemfile

@@ -70,7 +70,8 @@ gem 'lemmatizer', '~> 0.2.2'
 gem 'mailman', require: false
 # To implement fontawesome v4.7.0
 gem "font-awesome-rails"
- gem "lazyload-rails"
+gem "lazyload-rails"
+gem 'jquery-rails-cdn'
 
 # To convert html to markdown
 gem 'reverse_markdown'

app/views/layouts/application.html.erb

@@ -32,6 +32,7 @@
       <script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
     <![endif]-->
 
+    <%= jquery_include_tag :google, force: true %>
     <%= javascript_include_tag "application" %>
     <%= csrf_meta_tags %>
     <meta name="google-translate-customization" content="4ce4c7c384354172-5179499fc244f592-g2b333d0d29f59663-d" />

config/application.rb

@@ -54,15 +54,15 @@ class Application < Rails::Application
 
     # Enable the asset pipeline
     config.assets.enabled = true
-    
+
     I18n.available_locales = [:en, :de, "zh-CN", :ar, :es, "hi-IN", :it, :ko, "pt-BR", :ru]
-    config.i18n.default_locale = :en 
-    
+    config.i18n.default_locale = :en
+
     config.i18n.load_path += Dir[Rails.root.join('config', 'locales', '**', '*.{rb,yml}')]
 
     # rails will fallback to config.i18n.default_locale translation
     config.i18n.fallbacks = true
-    
+
     # rails will fallback to en, no matter what is set as config.i18n.default_locale
     config.i18n.fallbacks = [:en]
 
@@ -74,6 +74,8 @@ class Application < Rails::Application
     config.paths.add File.join('app/api'), glob: File.join('**', '*.rb')
     config.autoload_paths += Dir[Rails.root.join('app','api', '**', '*.rb')]
 
+    config.assets.precompile += ['jquery3.js']
+
     # Version of your assets, change this if you want to expire all your assets
     config.assets.version = '1.0'
     config.assets.paths << Rails.root.join("public","lib")

config/initializers/jquery_cdn.rb

@@ -0,0 +1 @@
+Jquery::Rails::Cdn.major_version = 3