Remove Commits#compare, add CompareController

app/views/compare/_head.html.haml

@@ -0,0 +1,23 @@
+%ul.nav.nav-tabs
+  %li= render partial: 'shared/ref_switcher', locals: {destination: 'commits'}
+  %li{class: "#{'active' if current_page?(project_commits_path(@project)) }"}
+    = link_to project_commits_path(@project) do
+      Commits
+  %li{class: "#{'active' if current_page?(compare_project_commits_path(@project)) }"}
+    = link_to compare_project_commits_path(@project) do
+      Compare
+  %li{class: "#{branches_tab_class}"}
+    = link_to project_repository_path(@project) do
+      Branches
+      %span.badge= @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.badge= @project.repo.tag_count
+
+  - if current_page?(project_commits_path(@project)) && current_user.private_token
+    %li.right
+      %span.rss-icon
+        = link_to project_commits_path(@project, :atom, { private_token: current_user.private_token, ref: @ref }), title: "Feed" do
+          = image_tag "rss_ui.png", title: "feed"