We need latest nokogiri so it compiles with Ruby 2.3.1

Gemfile

@@ -74,7 +74,7 @@ gem 'email_reply_trimmer', '0.1.3'
 gem 'image_optim', '0.20.2'
 gem 'multi_json'
 gem 'mustache'
-gem 'nokogiri'
+gem 'nokogiri', '1.6.8.rc3'
 gem 'omniauth'
 gem 'omniauth-openid'
 gem 'openid-redis-store'

Gemfile.lock

@@ -101,6 +101,7 @@ GEM
     faraday (0.9.2)
       multipart-post (>= 1.2, < 3)
     fast_blank (1.0.0)
+    fast_stack (0.2.0)
     fast_xor (1.1.3)
       rake
       rake-compiler
@@ -157,7 +158,7 @@ GEM
     metaclass (0.0.4)
     method_source (0.8.2)
     mime-types (2.99.1)
-    mini_portile2 (2.0.0)
+    mini_portile2 (2.1.0)
     minitest (5.8.4)
     mocha (1.1.0)
       metaclass (~> 0.0.1)
@@ -169,8 +170,9 @@ GEM
     multipart-post (2.0.0)
     mustache (1.0.3)
     netrc (0.11.0)
-    nokogiri (1.6.7.2)
-      mini_portile2 (~> 2.0.0.rc2)
+    nokogiri (1.6.8.rc3)
+      mini_portile2 (~> 2.1.0)
+      pkg-config (~> 1.1.7)
     nokogumbo (1.4.7)
       nokogiri
     oauth (0.4.7)
@@ -219,6 +221,7 @@ GEM
       redis
       ruby-openid
     pg (0.18.4)
+    pkg-config (1.1.7)
     progress (3.1.1)
     pry (0.10.3)
       coderay (~> 1.1.0)
@@ -441,7 +444,7 @@ DEPENDENCIES
   mock_redis
   multi_json
   mustache
-  nokogiri
+  nokogiri (= 1.6.8.rc3)
   oj
   omniauth
   omniauth-facebook