Merge branch '19003-file-view-subnav' into 'master'

Resolve "Sub nav isn't showing on file view"

## What does this MR do?
Adds subnav to `Repository` > `File` view

## What are the relevant issue numbers?
Closes #19003 
Part of #18844 

## Screenshots (if relevant)
![Screen_Shot_2016-06-23_at_5.33.05_PM](/uploads/aa6993b2376dbe454af87d852aa74f5e/Screen_Shot_2016-06-23_at_5.33.05_PM.png)

cc @dzaporozhets 

See merge request !4890

CHANGELOG

@@ -26,6 +26,7 @@ v 8.10.0 (unreleased)
 
 v 8.9.4 (unreleased)
   - Fixes middle click and double request when navigating through the file browser  !4891
+  - Add sub nav to file page view
 
 v 8.9.3
   - Fix encrypted data backwards compatibility after upgrading attr_encrypted gem. !4963
@@ -42,6 +43,9 @@ v 8.9.3
   - Fix missing avatar on system notes. !4954
   - Reduce overhead and optimize ProjectTeam#max_member_access performance. !4973
   - Use update_columns to by_pass all the dirty code on active_record. !4985
+  - Decreased min width of screen to 1280px for pinned sidebar
+  - Fix encrypted data backwards compatibility after upgrading attr_encrypted gem
+  - Update mobile button icons to be more inline with typical UI paradigms
 
 v 8.9.2
   - Fix visibility of snippets when searching.

app/views/projects/blob/show.html.haml

+- @no_container = true
 - page_title @blob.path, @ref
+= render "projects/commits/head"
 
-= render 'projects/last_push'
+%div{ class: (container_class) }
+  = render 'projects/last_push'
 
-%div#tree-holder.tree-holder
+  %div#tree-holder.tree-holder
     = render 'blob', blob: @blob
 
-- if can_edit_blob?(@blob)
+  - if can_edit_blob?(@blob)
     = render 'projects/blob/remove'
 
     - title = "Replace #{@blob.name}"