Switchable the main branch on network graph

app/views/graph/show.html.haml

@@ -0,0 +1,19 @@
+%h3.page_title Project Network Graph
+%br
+= render partial: 'shared/ref_switcher', locals: {destination: 'graph', path: @path}
+%br
+.graph_holder
+  %h4
+    %small You can move around the graph by using the arrow keys.
+  #holder.graph
+    .loading.loading-gray
+
+:javascript
+  var branch_graph;
+  $(function(){
+    branch_graph = new BranchGraph($("#holder"), {
+      url: '#{project_graph_path(@project, @ref, format: :json)}',
+      commit_url: '#{project_commit_path(@project, 'ae45ca32').gsub("ae45ca32", "%s")}',
+      ref: '#{@ref}'
+    });
+  });