Update nokogiri in Gemfile.lock

Keep up to date with required gems.

Author: oestrich

Gemfile.lock

@@ -53,11 +53,13 @@ GEM
     libwebsocket (0.1.3)
       addressable
     mime-types (1.18)
+    mini_portile (0.5.2)
     minitest (4.7.5)
     multi_json (1.8.2)
     multi_test (0.0.2)
     mustache (0.99.5)
-    nokogiri (1.5.2)
+    nokogiri (1.6.0)
+      mini_portile (~> 0.5.0)
     rack (1.5.2)
     rack-oauth2 (0.14.4)
       activesupport (>= 2.3)