Merge branch 'sidebar-overlap-fix' into 'master'

Fix issue with overlap of sidebar links.

Thanks @iamphill for the help with this one. 

![Screen_Shot_2016-03-01_at_10.19.52_AM](/uploads/f203fde79ae397ad18f23c4108f1c306/Screen_Shot_2016-03-01_at_10.19.52_AM.png)

cc @iamphill @alfredo1 @dzaporozhets @rymai 

See merge request !3043

app/assets/stylesheets/framework/sidebar.scss

@@ -13,7 +13,7 @@
     transition-duration: .3s;
   }
 
-  .home {
+  .gitlab-text-container-link {
     z-index: 1;
     position: absolute;
     left: 0px;

app/views/layouts/_page.html.haml

@@ -4,7 +4,7 @@
     .header-logo
       %a#logo
         = brand_header_logo
-      = link_to root_path, class: 'home', title: 'Dashboard', id: 'js-shortcuts-home' do
+      = link_to root_path, class: 'gitlab-text-container-link', title: 'Dashboard', id: 'js-shortcuts-home' do
         .gitlab-text-container
           %h3 GitLab
 

app/views/layouts/ci/_page.html.haml

@@ -4,7 +4,7 @@
     .header-logo
       %a#logo
         = brand_header_logo
-      = link_to root_path, class: 'home', title: 'Dashboard', id: 'js-shortcuts-home' do
+      = link_to root_path, class: 'gitlab-text-container-link', title: 'Dashboard', id: 'js-shortcuts-home' do
         .gitlab-text-container
           %h3 GitLab