Update Rouge to Version 1.8

Gemfile

@@ -2,7 +2,7 @@
 # the following line to use "https"
 source 'http://rubygems.org'
 
-gem "rouge", "1.7.2"
+gem "rouge", "~> 1.8.0"
 
 gem "middleman", "~>3.3.0"
 

Gemfile.lock

@@ -104,7 +104,7 @@ GEM
       ffi (>= 0.5.0)
     redcarpet (3.2.2)
     ref (1.0.5)
-    rouge (1.7.2)
+    rouge (1.8.0)
     ruby18_source_location (0.2)
     sass (3.4.9)
     sprockets (2.12.3)
@@ -142,7 +142,7 @@ DEPENDENCIES
   middleman-syntax
   rake (~> 10.4.0)
   redcarpet (~> 3.2.1)
-  rouge (= 1.7.2)
+  rouge (~> 1.8.0)
   ruby18_source_location
   therubyracer
   wdm (~> 0.1.0)

source/javascripts/app/lang.js

@@ -26,9 +26,9 @@ under the License.
     $(".lang-selector a").removeClass('active');
     $(".lang-selector a[data-language-name='" + language + "']").addClass('active');
     for (var i=0; i < languages.length; i++) {
-      $(".highlight." + languages[i]).parent().hide();
+      $(".highlight." + languages[i]).hide();
     }
-    $(".highlight." + language).parent().show();
+    $(".highlight." + language).show();
 
     global.toc.calculateHeights();