Don't instantiate builds for repos list to not load them

assets/javascripts/app/routes.coffee

@@ -178,6 +178,12 @@ Travis.Router = Ember.Router.extend
               router.get('repositoryController').set 'build', build
               router.get('repositoryController').activate 'build'
 
+            serialize: (router, build) ->
+              if build.get
+                { id: build.get('id') }
+              else
+                { id: build }
+
             deserialize: (router, params) ->
               # Something is wrong here. If I don't use deferred, id is not
               # initialized and url ends up being /jobs/null

assets/javascripts/app/templates/repos/list.hbs

@@ -15,8 +15,8 @@
           <a {{action showRepository this href=true}} class="slug">{{slug}}</a>
         {{/if}}
       </div>
-      {{#if lastBuild.id}}
-        <a {{action showBuild this lastBuild href=true}} class="last_build">{{lastBuildNumber}}</a>
+      {{#if lastBuildId}}
+        <a {{action showBuild this lastBuildId href=true}} class="last_build">{{lastBuildNumber}}</a>
       {{/if}}
 
       <p class="summary">