Use the faster alternative methods in grit to count tags and branches (which I...

Use the faster alternative methods in grit to count tags and branches (which I added). This is much faster in all cases, but especially on large repositories the difference should be obvious.

app/views/commits/_head.html.haml

@@ -13,12 +13,12 @@
   %li{:class => "#{branches_tab_class}"}
     = link_to project_repository_path(@project) do 
       Branches
-      %span.number= @project.repo.branches.count
+      %span.number= @project.repo.branch_count
 
   %li{:class => "#{'active' if current_page?(tags_project_repository_path(@project)) }"}
     = link_to tags_project_repository_path(@project) do 
       Tags
-      %span.number= @project.repo.tags.count
+      %span.number= @project.repo.tag_count
 
 
   - if current_page?(project_commits_path(@project)) && current_user.private_token