Upgrade Rollbar to latest version to fix the issue with rack

Gemfile

@@ -24,7 +24,7 @@ gem 'sdoc', '~> 0.4.0', group: :doc
 gem 'pg'
 gem 'devise'
 gem 'activeadmin', git: 'https://github.com/activeadmin/activeadmin.git'
-gem 'rollbar', '~> 2.5.0'
+gem 'rollbar', '~> 2.14.0'
 gem 'gcm'
 gem 'newrelic_rpm'
 

Gemfile.lock

@@ -190,7 +190,7 @@ GEM
     ref (2.0.0)
     responders (2.1.0)
       railties (>= 4.2.0, < 5)
-    rollbar (2.5.2)
+    rollbar (2.14.0)
       multi_json
     rspec-core (3.3.2)
       rspec-support (~> 3.3.0)
@@ -270,7 +270,7 @@ DEPENDENCIES
   newrelic_rpm
   pg
   rails (= 4.2.4)
-  rollbar (~> 2.5.0)
+  rollbar (~> 2.14.0)
   rspec-rails
   sass-rails (~> 5.0)
   sdoc (~> 0.4.0)
@@ -281,3 +281,6 @@ DEPENDENCIES
   turbolinks
   uglifier (>= 1.3.0)
   web-console (~> 2.0)
+
+BUNDLED WITH
+   1.13.7