Merge branch '18333-layout-bug' into 'master'

Use container helper instead of hard coded container

## What does this MR do?
Add `container_class` helper class to fix layout bug

## What are the relevant issue numbers?
#18333 
## Screenshots (if relevant)
Fixed:    
![Screen_Shot_2016-06-08_at_2.03.38_PM](/uploads/6e7575d711efb8eaf6ba641907b2d607/Screen_Shot_2016-06-08_at_2.03.38_PM.png)
Fluid:     
![Screen_Shot_2016-06-08_at_2.03.56_PM](/uploads/33d3f73781ca9ed129f853abfe9feb4b/Screen_Shot_2016-06-08_at_2.03.56_PM.png)

See merge request !4543

app/views/groups/show.html.haml

@@ -5,7 +5,7 @@
     = auto_discovery_link_tag(:atom, group_url(@group, format: :atom, private_token: current_user.private_token), title: "#{@group.name} activity")
 .cover-block.groups-cover-block
-  .container-fluid.container-limited
+  %div{ class: (container_class) }
     = link_to group_icon(@group), target: '_blank' do
       = image_tag group_icon(@group), class: "avatar group-avatar s70"
     .group-info

app/views/projects/_home_panel.html.haml

 - empty_repo = @project.empty_repo?
 .project-home-panel.cover-block.clearfix{:class => ("empty-project" if empty_repo)}
-  .container-fluid.container-limited
+  %div{ class: (container_class) }
     .row
       .project-image-container
         = project_icon(@project, alt: '', class: 'project-avatar avatar s70')

app/views/projects/show.html.haml

@@ -13,7 +13,7 @@
 = render "home_panel"
 .project-stats.row-content-block.second-block
-  .container-fluid.container-limited
+  %div{ class: (container_class) }
     %ul.nav
       %li
         = link_to project_files_path(@project) do