Remove the react-rails gem (#2801)

* Remove react-rails gem

* Fix broken view spec

Gemfile.lock

@@ -60,10 +60,6 @@ GEM
     aws-sdk-resources (2.9.14)
       aws-sdk-core (= 2.9.14)
     aws-sigv4 (1.0.0)
-    babel-source (5.8.35)
-    babel-transpiler (0.7.0)
-      babel-source (>= 4.0, < 6)
-      execjs (~> 2.0)
     bcrypt (3.1.11)
     better_errors (2.1.1)
       coderay (>= 1.0.0)
@@ -339,12 +335,6 @@ GEM
     rainbow (2.2.2)
       rake
     rake (11.3.0)
-    react-rails (2.1.0)
-      babel-transpiler (>= 0.7.0)
-      connection_pool
-      execjs
-      railties (>= 3.2)
-      tilt
     redis (3.3.3)
     redis-actionpack (5.0.1)
       actionpack (>= 4.0, < 6)
@@ -528,7 +518,6 @@ DEPENDENCIES
   rails-i18n
   rails-settings-cached
   rails_12factor
-  react-rails
   redis (~> 3.2)
   redis-rails
   rqrcode