Bump rails, rack, and moped dependencies for security updates.

Rails security updates:
http://weblog.rubyonrails.org/2015/6/16/Rails-3-2-22-4-1-11-and-4-2-2-have-been-released-and-more/

Related rack update:
rack/rack#894

Moped security updates:
mongoid/moped#377

Gemfile

@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 source "https://rails-assets.org"
 
-gem "rails", "~> 3.2.21"
+gem "rails", "~> 3.2.22"
 
 # Rails app server
 gem "puma", "~> 2.11.2"

Gemfile.lock

@@ -27,12 +27,12 @@ GEM
   remote: https://rubygems.org/
   remote: https://rails-assets.org/
   specs:
-    actionmailer (3.2.21)
-      actionpack (= 3.2.21)
+    actionmailer (3.2.22)
+      actionpack (= 3.2.22)
       mail (~> 2.5.4)
-    actionpack (3.2.21)
-      activemodel (= 3.2.21)
-      activesupport (= 3.2.21)
+    actionpack (3.2.22)
+      activemodel (= 3.2.22)
+      activesupport (= 3.2.22)
       builder (~> 3.0.0)
       erubis (~> 2.7.0)
       journey (~> 1.0.4)
@@ -42,18 +42,18 @@ GEM
       sprockets (~> 2.2.1)
     active_model_serializers (0.9.0)
       activemodel (>= 3.2)
-    activemodel (3.2.21)
-      activesupport (= 3.2.21)
+    activemodel (3.2.22)
+      activesupport (= 3.2.22)
       builder (~> 3.0.0)
-    activerecord (3.2.21)
-      activemodel (= 3.2.21)
-      activesupport (= 3.2.21)
+    activerecord (3.2.22)
+      activemodel (= 3.2.22)
+      activesupport (= 3.2.22)
       arel (~> 3.0.2)
       tzinfo (~> 0.3.29)
-    activeresource (3.2.21)
-      activemodel (= 3.2.21)
-      activesupport (= 3.2.21)
-    activesupport (3.2.21)
+    activeresource (3.2.22)
+      activemodel (= 3.2.22)
+      activesupport (= 3.2.22)
+    activesupport (3.2.22)
       i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
     addressable (2.3.8)
@@ -211,8 +211,8 @@ GEM
       execjs
       multi_json (>= 1.3)
       rake
-    json (1.8.2)
-    json (1.8.2-java)
+    json (1.8.3)
+    json (1.8.3-java)
     jwt (1.4.1)
     kaminari (0.16.3)
       actionpack (>= 3.0.0)
@@ -227,7 +227,7 @@ GEM
       treetop (~> 1.4.8)
     mime-types (1.25.1)
     mini_portile (0.6.2)
-    mongoid (3.1.6)
+    mongoid (3.1.7)
       activemodel (~> 3.2)
       moped (~> 1.4)
       origin (~> 1.0)
@@ -243,8 +243,8 @@ GEM
       railties (>= 3.2.0)
     mongoid_userstamp (0.3.2)
       mongoid (>= 3.0.4)
-    moped (1.5.2)
-    multi_json (1.11.0)
+    moped (1.5.3)
+    multi_json (1.11.1)
     multi_xml (0.5.5)
     multipart-post (2.0.0)
     net-ldap (0.3.1)
@@ -323,7 +323,7 @@ GEM
     pyu-ruby-sasl (0.0.3.3)
     rabl (0.11.6)
       activesupport (>= 2.3.14)
-    rack (1.4.5)
+    rack (1.4.6)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-proxy (0.5.17)
@@ -333,14 +333,14 @@ GEM
     rack-test (0.6.3)
       rack (>= 1.0)
     rack-timeout (0.0.4)
-    rails (3.2.21)
-      actionmailer (= 3.2.21)
-      actionpack (= 3.2.21)
-      activerecord (= 3.2.21)
-      activeresource (= 3.2.21)
-      activesupport (= 3.2.21)
+    rails (3.2.22)
+      actionmailer (= 3.2.22)
+      actionpack (= 3.2.22)
+      activerecord (= 3.2.22)
+      activeresource (= 3.2.22)
+      activesupport (= 3.2.22)
       bundler (~> 1.0)
-      railties (= 3.2.21)
+      railties (= 3.2.22)
     rails-assets-ace-builds (1.1.9)
     rails-assets-bootbox (3.3.0)
     rails-assets-bootstrap-daterangepicker (1.3.17)
@@ -390,9 +390,9 @@ GEM
     rails_config (0.4.2)
       activesupport (>= 3.0)
     rails_stdout_logging (0.0.3)
-    railties (3.2.21)
-      actionpack (= 3.2.21)
-      activesupport (= 3.2.21)
+    railties (3.2.22)
+      actionpack (= 3.2.22)
+      activesupport (= 3.2.22)
       rack-ssl (~> 1.3.2)
       rake (>= 0.8.7)
       rdoc (~> 3.4)
@@ -479,7 +479,7 @@ GEM
     turbo-sprockets-rails3 (0.3.13)
       railties (> 3.2.8, < 4.0.0)
       sprockets (>= 2.2.0)
-    tzinfo (0.3.43)
+    tzinfo (0.3.44)
     uglifier (2.7.1)
       execjs (>= 0.3.0)
       json (>= 1.8.0)
@@ -567,7 +567,7 @@ DEPENDENCIES
   rabl (~> 0.11.5)
   rack-proxy (~> 0.5.17)
   rack-timeout (~> 0.0.4)
-  rails (~> 3.2.21)
+  rails (~> 3.2.22)
   rails-assets-ace-builds (~> 1.1.7)
   rails-assets-bootbox (~> 3.3.0)
   rails-assets-bootstrap-daterangepicker (~> 1.3.12)