Add es6 gem

Gemfile

@@ -9,6 +9,7 @@ gem 'responders', '~> 2.0'
 # Specify a sprockets version due to increased performance
 # See https://gitlab.com/gitlab-org/gitlab-ce/issues/6069
 gem 'sprockets', '~> 3.6.0'
+gem 'sprockets-es6'
 
 # Default values for AR models
 gem 'default_value_for', '~> 3.0.0'

Gemfile.lock

@@ -85,6 +85,10 @@ GEM
       faraday (~> 0.9)
       faraday_middleware (~> 0.10)
       nokogiri (~> 1.6)
+    babel-source (5.8.35)
+    babel-transpiler (0.7.0)
+      babel-source (>= 4.0, < 6)
+      execjs (~> 2.0)
     babosa (1.0.2)
     base32 (0.3.2)
     bcrypt (3.1.11)
@@ -700,6 +704,10 @@ GEM
     sprockets (3.6.3)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
+    sprockets-es6 (0.9.0)
+      babel-source (>= 5.8.11)
+      babel-transpiler
+      sprockets (>= 3.0.0)
     sprockets-rails (3.1.1)
       actionpack (>= 4.0)
       activesupport (>= 4.0)
@@ -963,6 +971,7 @@ DEPENDENCIES
   spring-commands-spinach (~> 1.1.0)
   spring-commands-teaspoon (~> 0.0.2)
   sprockets (~> 3.6.0)
+  sprockets-es6
   state_machines-activerecord (~> 0.4.0)
   sys-filesystem (~> 1.1.6)
   task_list (~> 1.0.2)