allow limiting the amount of repos to display

by setting github_repo_count to someething that's not 0, you can limit
the amount of repositories to render

.themes/classic/source/_includes/asides/github.html

@@ -13,7 +13,12 @@ <h1>Github Repos</h1>
             var s = document.getElementsByTagName('script')[0];
             s.parentNode.insertBefore(jxhr, s);
         }
-        github.showRepos('{{site.github_user}}', '#gh_repos');
+
+        github.showRepos({
+            user: '{{site.github_user}}',
+            count: {{site.github_repo_count}},
+            target: '#gh_repos'
+        });
     });
   </script>
   <script src="{{ root_url }}/javascripts/github.js" type="text/javascript"> </script>

.themes/classic/source/javascripts/github.js

@@ -8,10 +8,10 @@ github = (function(){
         t.innerHTML =  fragment;
     }
     return {
-        showRepos: function(user, target){
+        showRepos: function(options){
             var feed = new jXHR();
             feed.onerror = function (msg,url) {
-              $(target + ' li.loading').addClass('error').text("Error loading feed");
+              $(options.target + ' li.loading').addClass('error').text("Error loading feed");
             }
             feed.onreadystatechange = function(data){
               if (feed.readyState === 4) {
@@ -27,11 +27,15 @@ github = (function(){
 
                     if (a.valueOf() == b.valueOf()) return 0;
                     return a.valueOf() > b.valueOf() ? -1 : 1;
-                })
-                render(target, repos)
+                });
+
+                if (options.count)
+                    repos.splice(options.count);
+
+                render(options.target, repos)
               }
             };
-            feed.open("GET","http://github.com/api/v2/json/repos/show/"+user+"?callback=?");
+            feed.open("GET","http://github.com/api/v2/json/repos/show/"+options.user+"?callback=?");
             feed.send();
         }
     };

_config.yml

@@ -57,6 +57,7 @@ twitter_tweet_button: true
 
 # github repositories
 github_user:
+github_repo_count: 0
 
 # Google Plus
 google_plus_one: true