created file sync

web/Gemfile.lock

@@ -1,5 +1,6 @@
 GEM
   remote: https://rubygems.org/
+  remote: https://rails-assets.org/
   specs:
     ace-rails-ap (4.0.1)
     actionmailer (4.2.5.1)
@@ -101,6 +102,7 @@ GEM
       bundler (>= 1.3.0, < 2.0)
       railties (= 4.2.5.1)
       sprockets-rails
+    rails-assets-tether (1.2.0)
     rails-deprecated_sanitizer (1.0.3)
       activesupport (>= 4.2.0.alpha)
     rails-dom-testing (1.0.7)
@@ -174,6 +176,7 @@ DEPENDENCIES
   jquery-rails
   puma
   rails (= 4.2.5.1)
+  rails-assets-tether (>= 1.1.0)!
   rubocop
   sass-rails (~> 5.0)
   sdoc (~> 0.4.0)