EDUCATOR-232 | Upgrade nokogiri to 1.8.1

Gemfile

@@ -31,7 +31,7 @@ gem 'mongoid_magic_counter_cache'
 
 gem 'will_paginate_mongoid', "~>2.0"
 gem 'rdiscount'
-gem 'nokogiri', "~>1.6.8"
+gem 'nokogiri', "~>1.8.1"
 
 gem 'elasticsearch', '~> 1.1.2'
 gem 'elasticsearch-model', '~> 0.1.9'

Gemfile.lock

@@ -103,7 +103,7 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mini_portile2 (2.1.0)
+    mini_portile2 (2.3.0)
     minitest (5.10.2)
     mongo (2.1.2)
       bson (~> 3.0)
@@ -125,8 +125,8 @@ GEM
     nenv (0.3.0)
     netrc (0.11.0)
     newrelic_rpm (3.16.3.323)
-    nokogiri (1.6.8.1)
-      mini_portile2 (~> 2.1.0)
+    nokogiri (1.8.1)
+      mini_portile2 (~> 2.3.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -235,7 +235,7 @@ DEPENDENCIES
   mongoid_cleaner (~> 1.2.0)
   mongoid_magic_counter_cache
   newrelic_rpm
-  nokogiri (~> 1.6.8)
+  nokogiri (~> 1.8.1)
   protected_attributes
   pry
   pry-nav
@@ -257,4 +257,4 @@ DEPENDENCIES
   yajl-ruby
 
 BUNDLED WITH
-   1.15.2
+   1.16.0