Fix showMore

We use ArrayProxy with SortableMixin as container for builds, so
it needs to proxy load method to expandable record array.

closes #49

assets/scripts/app/controllers/repo.coffee

@@ -9,6 +9,11 @@ Travis.RepoController = Travis.Controller.extend
       sortProperties: ['number']
       sortAscending: false
       content: []
+      isLoadingBinding: 'content.isLoading'
+      load: (records) ->
+        content = @get('content')
+        if content && content.load
+          content.load(records)
     )
 
   updateTimes: ->

assets/scripts/app/views/build.coffee

@@ -4,7 +4,7 @@
     buildsBinding: 'controller.builds'
 
     showMore: ->
-      id = @get('controller.repo.id')
+      id     = @get('controller.repo.id')
       number = @get('builds.lastObject.number')
       @get('builds').load Travis.Build.olderThanNumber(id, number)