Merge branch 'push-event-banner-container' into 'master'

Fixed last push event banner not being in container

## What does this MR do?

Adds the last push event content into a container with the correct class.

## What are the relevant issue numbers?

Closes #18567 

## Screenshots (if relevant)

![Screen_Shot_2016-06-14_at_13.17.41](/uploads/4afa3d2c73e59c5ffbd53869e49baa92/Screen_Shot_2016-06-14_at_13.17.41.png)

See merge request !4644

app/assets/stylesheets/framework/blocks.scss

@@ -91,6 +91,10 @@
     background-color: $white-light;
     border-top: none;
   }
+
+  &.top-block .container-fluid {
+    background-color: inherit;
+  }
 }
 
 .cover-block {

app/views/projects/_last_push.html.haml

 - if event = last_push_event
   - if show_last_push_widget?(event)
-
     .row-content-block.top-block.clear-block.hidden-xs
+      %div{ class: (container_class) }
         .event-last-push
           .event-last-push-text
             %span You pushed to