Add pipelines badge to MR tab

app/assets/stylesheets/pages/pipelines.scss

@@ -233,11 +233,7 @@
 .pipelines.tab-pane {
 
   .content-list.pipelines {
-    width: auto;
-  }
-
-  .table.builds {
-    min-width: 900px;
+    overflow: scroll;
   }
 
   .stage {

app/views/projects/merge_requests/_show.html.haml

@@ -56,7 +56,7 @@
           %li.pipelines-tab
             = link_to pipelines_namespace_project_merge_request_path(@project.namespace, @project, @merge_request), data: { target: '#pipelines', action: 'pipelines', toggle: 'tab' } do
               Pipelines
-              %span.badge
+              %span.badge= @merge_request.all_pipelines.size
           %li.builds-tab
             = link_to builds_namespace_project_merge_request_path(@project.namespace, @project, @merge_request), data: { target: '#builds', action: 'builds', toggle: 'tab' } do
               Builds