Revert "bump sidekiq"

This reverts commit 9307a1a.

Gemfile

@@ -17,7 +17,7 @@ gem 'devise', '2.1.3'
 
 # Background processing
 
-gem 'sidekiq', '2.12.0'
+gem 'sidekiq', '2.11.1'
 gem 'sinatra', '1.3.3'
 gem 'slim', '1.3.8'
 

Gemfile.lock

@@ -55,7 +55,7 @@ GEM
     carrierwave (0.8.0)
       activemodel (>= 3.2.0)
       activesupport (>= 3.2.0)
-    celluloid (0.14.0)
+    celluloid (0.13.0)
       timers (>= 1.0.0)
     childprocess (0.3.9)
       ffi (~> 1.0, >= 1.0.11)
@@ -209,7 +209,7 @@ GEM
     mobile-fu (1.1.1)
       rack-mobile-detect
       rails
-    multi_json (1.7.3)
+    multi_json (1.7.2)
     multipart-post (1.2.0)
     mysql2 (0.3.11)
     nested_form (0.3.2)
@@ -308,7 +308,7 @@ GEM
       json (~> 1.4)
     redcarpet (2.2.2)
     redis (3.0.4)
-    redis-namespace (1.3.0)
+    redis-namespace (1.2.1)
       redis (~> 3.0.0)
     remotipart (1.0.5)
     rmagick (2.13.2)
@@ -346,11 +346,11 @@ GEM
       multi_json (~> 1.0)
       rubyzip
       websocket (~> 1.0.4)
-    sidekiq (2.12.0)
-      celluloid (>= 0.14.0)
-      connection_pool (>= 1.0.0)
-      json
-      redis (>= 3.0)
+    sidekiq (2.11.1)
+      celluloid (~> 0.13.0)
+      connection_pool (~> 1.0)
+      multi_json (~> 1)
+      redis (~> 3)
       redis-namespace
     simple_oauth (0.2.0)
     sinatra (1.3.3)
@@ -470,7 +470,7 @@ DEPENDENCIES
   ruby-oembed (= 0.8.8)
   sass-rails (= 3.2.6)
   selenium-webdriver (= 2.32.1)
-  sidekiq (= 2.12.0)
+  sidekiq (= 2.11.1)
   sinatra (= 1.3.3)
   sinon-rails (= 1.4.2.1)
   slim (= 1.3.8)