Replace sprockets/browserify with Webpack (#2617)

* Replace browserify with webpack

* Add react-intl-translations-manager

* Do not minify in development, add offline-plugin for ServiceWorker background cache updates

* Adjust tests and dependencies

* Fix production deployments

* Fix tests

* More optimizations

* Improve travis cache for npm stuff

* Re-run travis

* Add back support for custom.scss as before

* Remove offline-plugin and babili

* Fix issue with Immutable.List().unshift(...values) not working as expected

* Make travis load schema instead of running all migrations in sequence

* Fix missing React import in WarningContainer. Optimize rendering performance by using ImmutablePureComponent instead of
React.PureComponent. ImmutablePureComponent uses Immutable.is() to compare props. Replace dynamic callback bindings in
<UI />

* Add react definitions to places that use JSX

* Add Procfile.dev for running rails, webpack and streaming API at the same time

app/helpers/application_helper.rb

@@ -10,7 +10,7 @@ module ApplicationHelper
   end
 
   def add_rtl_body_class(other_classes)
-    other_classes = "#{other_classes} rtl" if [:ar, :fa].include?(I18n.locale)
+    other_classes = "#{other_classes} rtl" if [:ar, :fa, :he].include?(I18n.locale)
     other_classes
   end
 
@@ -22,4 +22,8 @@ module ApplicationHelper
   def title
     Rails.env.production? ? site_title : "#{site_title} (Dev)"
   end
+
+  def fa_icon(icon)
+    content_tag(:i, nil, class: 'fa ' + icon.split(' ').map { |cl| "fa-#{cl}" }.join(' '))
+  end
 end