Merge branch 'no-icon-for-back' into 'master'

Hide icon for bact-to-location menu in sidebar

cc @JobV

![Screenshot_2015-07-13_11.37.39](https://gitlab.com/gitlab-org/gitlab-ce/uploads/39d871b6a0e0e555cb497aee865a2f45/Screenshot_2015-07-13_11.37.39.png)

See merge request !968

app/assets/stylesheets/generic/sidebar.scss

@@ -96,6 +96,12 @@
 
     .nav-sidebar li a{
       width: 230px;
+
+      &.back-link {
+        i {
+          visibility: hidden;
+        }
+      }
     }
   }
 }

app/views/layouts/nav/_group.html.haml

 %ul.nav.nav-sidebar
   = nav_link do
-    = link_to root_path, title: 'Back to dashboard', data: {placement: 'right'} do
+    = link_to root_path, title: 'Back to dashboard', data: {placement: 'right'}, class: 'back-link' do
       = icon('caret-square-o-left fw')
       %span
         Back to Dashboard

app/views/layouts/nav/_group_settings.html.haml

 %ul.nav.nav-sidebar
   = nav_link do
-    = link_to group_path(@group), title: 'Back to group', data: {placement: 'right'} do
+    = link_to group_path(@group), title: 'Back to group', data: {placement: 'right'}, class: 'back-link' do
       = icon('caret-square-o-left fw')
       %span
         Back to group

app/views/layouts/nav/_profile.html.haml

 %ul.nav.nav-sidebar
   = nav_link do
-    = link_to root_path, title: 'Back to dashboard', data: {placement: 'right'} do
+    = link_to root_path, title: 'Back to dashboard', data: {placement: 'right'}, class: 'back-link' do
       = icon('caret-square-o-left fw')
       %span
         Back to Dashboard

app/views/layouts/nav/_project.html.haml

 %ul.nav.nav-sidebar
   - if @project.group
     = nav_link do
-      = link_to group_path(@project.group), title: 'Back to group', data: {placement: 'right'} do
+      = link_to group_path(@project.group), title: 'Back to group', data: {placement: 'right'}, class: 'back-link' do
         = icon('caret-square-o-left fw')
         %span
           Back to Group
   - else
     = nav_link do
-      = link_to root_path, title: 'Back to dashboard', data: {placement: 'right'} do
+      = link_to root_path, title: 'Back to dashboard', data: {placement: 'right'}, class: 'back-link' do
         = icon('caret-square-o-left fw')
         %span
           Back to Dashboard

app/views/layouts/nav/_project_settings.html.haml

 %ul.nav.nav-sidebar
   = nav_link do
-    = link_to project_path(@project), title: 'Back to project', data: {placement: 'right'} do
+    = link_to project_path(@project), title: 'Back to project', data: {placement: 'right'}, class: 'back-link' do
       = icon('caret-square-o-left fw')
       %span
         Back to project