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

Gemfile.lock

@@ -43,15 +43,13 @@ GEM
       public_suffix (~> 2.0, >= 2.0.2)
     airbrussh (1.2.0)
       sshkit (>= 1.6.1, != 1.7.0)
-    annotate (2.7.1)
-      activerecord (>= 3.2, < 6.0)
-      rake (>= 10.4, < 12.0)
+    annotate (2.6.5)
+      activerecord (>= 2.3.0)
+      rake (>= 0.8.7)
     arel (7.1.4)
     ast (2.3.0)
     attr_encrypted (3.0.3)
       encryptor (~> 3.0.0)
-    autoprefixer-rails (6.7.7.2)
-      execjs
     av (0.9.0)
       cocaine (~> 0.5.3)
     aws-sdk (2.9.12)
@@ -76,10 +74,6 @@ GEM
       rack (>= 0.9.0)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
-    browserify-rails (4.1.0)
-      addressable (>= 2.4.0)
-      railties (>= 4.0.0, < 5.1)
-      sprockets (>= 3.6.0)
     builder (3.2.3)
     bullet (5.5.1)
       activesupport (>= 3.0.0)
@@ -92,8 +86,6 @@ GEM
     capistrano-bundler (1.2.0)
       capistrano (~> 3.1)
       sshkit (~> 1.2)
-    capistrano-faster-assets (1.0.2)
-      capistrano (>= 3.1)
     capistrano-rails (1.2.3)
       capistrano (~> 3.1)
       capistrano-bundler (~> 1.1)
@@ -161,8 +153,6 @@ GEM
     faker (1.7.3)
       i18n (~> 0.5)
     fast_blank (1.0.0)
-    font-awesome-rails (4.7.0.1)
-      railties (>= 3.2, < 5.1)
     fuubar (2.2.0)
       rspec-core (~> 3.0)
       ruby-progressbar (~> 1.4)
@@ -210,10 +200,6 @@ GEM
       rainbow (~> 2.2)
       terminal-table (>= 1.5.1)
     jmespath (1.3.1)
-    jquery-rails (4.3.1)
-      rails-dom-testing (>= 1, < 3)
-      railties (>= 4.2.0)
-      thor (>= 0.14, < 2.0)
     json (2.1.0)
     kaminari (1.0.1)
       activesupport (>= 4.1.0)
@@ -257,6 +243,7 @@ GEM
     mimemagic (0.3.2)
     mini_portile2 (2.1.0)
     minitest (5.10.1)
+    multi_json (1.12.1)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
     net-ssh (4.1.0)
@@ -348,8 +335,8 @@ GEM
       thor (>= 0.18.1, < 2.0)
     rainbow (2.2.2)
       rake
-    rake (11.3.0)
-    react-rails (1.11.0)
+    rake (12.0.0)
+    react-rails (2.1.0)
       babel-transpiler (>= 0.7.0)
       connection_pool
       execjs
@@ -410,13 +397,6 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.4.4)
       nokogumbo (~> 1.4.1)
-    sass (3.4.23)
-    sass-rails (5.0.6)
-      railties (>= 4.0.0, < 6)
-      sass (~> 3.1)
-      sprockets (>= 2.8, < 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-      tilt (>= 1.1, < 3)
     sidekiq (4.2.10)
       concurrent-ruby (~> 1.0)
       connection_pool (~> 2.2, >= 2.2.0)
@@ -473,6 +453,10 @@ GEM
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff
+    webpacker (1.2)
+      activesupport (>= 4.2)
+      multi_json (~> 1.2)
+      railties (>= 4.2)
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.2)
@@ -487,15 +471,12 @@ DEPENDENCIES
   active_record_query_trace
   addressable
   annotate
-  autoprefixer-rails
   aws-sdk (>= 2.0)
   best_in_place (~> 3.0.1)
   better_errors
   binding_of_caller
-  browserify-rails
   bullet
   capistrano (= 3.8.0)
-  capistrano-faster-assets (~> 1.0)
   capistrano-rails
   capistrano-rbenv
   capistrano-yarn
@@ -507,7 +488,6 @@ DEPENDENCIES
   fabrication
   faker
   fast_blank
-  font-awesome-rails
   fuubar
   goldfinger
   hamlit-rails
@@ -517,7 +497,6 @@ DEPENDENCIES
   http_accept_language
   httplog
   i18n-tasks (~> 0.9.6)
-  jquery-rails
   kaminari
   letter_opener
   letter_opener_web
@@ -554,7 +533,6 @@ DEPENDENCIES
   rubocop (= 0.46.0)
   ruby-oembed
   sanitize
-  sass-rails (~> 5.0)
   sidekiq
   sidekiq-unique-jobs
   simple-navigation
@@ -566,6 +544,7 @@ DEPENDENCIES
   tzinfo-data
   uglifier (>= 1.3.0)
   webmock
+  webpacker (~> 1.2)
   whatlanguage
 
 RUBY VERSION