Update gems for security

Mainly updated three gems for the following security reasons

actionview:
  https://groups.google.com/forum/#!topic/rubyonrails-security/I-VWr034ouk

activerecord:
  https://groups.google.com/forum/#!topic/rubyonrails-security/rgO20zYW33s

nokogiri:
  sparklemotion/nokogiri#1473
  sparklemotion/nokogiri#1615

Gemfile.lock

@@ -1,49 +1,48 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actionmailer (4.2.6)
-      actionpack (= 4.2.6)
-      actionview (= 4.2.6)
-      activejob (= 4.2.6)
+    actionmailer (4.2.8)
+      actionpack (= 4.2.8)
+      actionview (= 4.2.8)
+      activejob (= 4.2.8)
       mail (~> 2.5, >= 2.5.4)
       rails-dom-testing (~> 1.0, >= 1.0.5)
-    actionpack (4.2.6)
-      actionview (= 4.2.6)
-      activesupport (= 4.2.6)
+    actionpack (4.2.8)
+      actionview (= 4.2.8)
+      activesupport (= 4.2.8)
       rack (~> 1.6)
       rack-test (~> 0.6.2)
       rails-dom-testing (~> 1.0, >= 1.0.5)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (4.2.6)
-      activesupport (= 4.2.6)
+    actionview (4.2.8)
+      activesupport (= 4.2.8)
       builder (~> 3.1)
       erubis (~> 2.7.0)
       rails-dom-testing (~> 1.0, >= 1.0.5)
-      rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    activejob (4.2.6)
-      activesupport (= 4.2.6)
+      rails-html-sanitizer (~> 1.0, >= 1.0.3)
+    activejob (4.2.8)
+      activesupport (= 4.2.8)
       globalid (>= 0.3.0)
-    activemodel (4.2.6)
-      activesupport (= 4.2.6)
+    activemodel (4.2.8)
+      activesupport (= 4.2.8)
       builder (~> 3.1)
-    activerecord (4.2.6)
-      activemodel (= 4.2.6)
-      activesupport (= 4.2.6)
+    activerecord (4.2.8)
+      activemodel (= 4.2.8)
+      activesupport (= 4.2.8)
       arel (~> 6.0)
-    activesupport (4.2.6)
+    activesupport (4.2.8)
       i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
     addressable (2.4.0)
-    arel (6.0.3)
+    arel (6.0.4)
     ast (2.2.0)
     awesome_print (1.6.1)
     bourbon (4.2.7)
       sass (~> 3.4)
       thor (~> 0.19)
-    builder (3.2.2)
+    builder (3.2.3)
     bundler-audit (0.5.0)
       bundler (~> 1.2)
       thor (~> 0.18)
@@ -59,7 +58,7 @@ GEM
       capybara (>= 2.3.0, < 2.8.0)
       json
     coderay (1.1.1)
-    concurrent-ruby (1.0.2)
+    concurrent-ruby (1.0.5)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     database_cleaner (1.5.3)
@@ -86,8 +85,8 @@ GEM
       activesupport
       capybara
       i18n
-    globalid (0.3.6)
-      activesupport (>= 4.1.0)
+    globalid (0.4.0)
+      activesupport (>= 4.2.0)
     guard (2.14.0)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
@@ -108,7 +107,7 @@ GEM
     httparty (0.13.7)
       json (~> 1.8)
       multi_xml (>= 0.5.2)
-    i18n (0.7.0)
+    i18n (0.8.1)
     i18n-tasks (0.9.5)
       activesupport (>= 4.0.2)
       ast (>= 2.1.0)
@@ -123,7 +122,7 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.3)
+    json (1.8.6)
     kgio (2.10.0)
     launchy (2.4.3)
       addressable (~> 2.3)
@@ -134,22 +133,22 @@ GEM
     loofah (2.0.3)
       nokogiri (>= 1.5.9)
     lumberjack (1.0.10)
-    mail (2.6.4)
+    mail (2.6.5)
       mime-types (>= 1.16, < 4)
     method_source (0.8.2)
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mini_portile2 (2.0.0)
-    minitest (5.9.0)
+    mini_portile2 (2.1.0)
+    minitest (5.10.2)
     multi_json (1.12.1)
     multi_xml (0.5.5)
     neat (1.7.4)
       bourbon (>= 4.0)
       sass (>= 3.3)
     nenv (0.3.0)
-    nokogiri (1.6.7.2)
-      mini_portile2 (~> 2.0.0.rc2)
+    nokogiri (1.7.2)
+      mini_portile2 (~> 2.1.0)
     normalize-rails (4.1.1)
     notiffany (0.1.0)
       nenv (~> 0.1)
@@ -164,36 +163,36 @@ GEM
       slop (~> 3.4)
     pry-rails (0.3.4)
       pry (>= 0.9.10)
-    rack (1.6.4)
+    rack (1.6.6)
     rack-test (0.6.3)
       rack (>= 1.0)
     rack-timeout (0.4.2)
-    rails (4.2.6)
-      actionmailer (= 4.2.6)
-      actionpack (= 4.2.6)
-      actionview (= 4.2.6)
-      activejob (= 4.2.6)
-      activemodel (= 4.2.6)
-      activerecord (= 4.2.6)
-      activesupport (= 4.2.6)
+    rails (4.2.8)
+      actionmailer (= 4.2.8)
+      actionpack (= 4.2.8)
+      actionview (= 4.2.8)
+      activejob (= 4.2.8)
+      activemodel (= 4.2.8)
+      activerecord (= 4.2.8)
+      activesupport (= 4.2.8)
       bundler (>= 1.3.0, < 2.0)
-      railties (= 4.2.6)
+      railties (= 4.2.8)
       sprockets-rails
     rails-deprecated_sanitizer (1.0.3)
       activesupport (>= 4.2.0.alpha)
-    rails-dom-testing (1.0.7)
+    rails-dom-testing (1.0.8)
       activesupport (>= 4.2.0.beta, < 5.0)
-      nokogiri (~> 1.6.0)
+      nokogiri (~> 1.6)
       rails-deprecated_sanitizer (>= 1.0.1)
     rails-html-sanitizer (1.0.3)
       loofah (~> 2.0)
-    railties (4.2.6)
-      actionpack (= 4.2.6)
-      activesupport (= 4.2.6)
+    railties (4.2.8)
+      actionpack (= 4.2.8)
+      activesupport (= 4.2.8)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     raindrops (0.16.0)
-    rake (11.1.2)
+    rake (12.0.0)
     rb-fsevent (0.9.7)
     rb-inotify (0.9.7)
       ffi (>= 0.5.0)
@@ -242,26 +241,26 @@ GEM
     spring (1.7.1)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
-    sprockets (3.6.0)
+    sprockets (3.7.1)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-rails (3.0.4)
+    sprockets-rails (3.2.0)
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
     term-ansicolor (1.3.2)
       tins (~> 1.0)
     terminal-table (1.6.0)
-    thor (0.19.1)
+    thor (0.19.4)
     thread (0.2.2)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (2.0.5)
     timecop (0.8.1)
     tins (1.10.2)
     title (0.0.7)
       i18n
       rails (>= 3.1)
-    tzinfo (1.2.2)
+    tzinfo (1.2.3)
       thread_safe (~> 0.1)
     uglifier (3.0.0)
       execjs (>= 0.3.0, < 3)