Restore edit button in project readme

app/assets/stylesheets/pages/projects.scss

@@ -544,5 +544,13 @@ pre.light-well {
 }
 
 .project-show-readme .readme-holder {
+  margin-left: -$gl-padding;
+  margin-right: -$gl-padding;
+  padding: $gl-padding;
   border-top: 0;
+  
+  .edit-project-readme {
+    z-index: 100;
+    position: relative;
+  }
 }

app/views/projects/_readme.html.haml

 - if readme = @repository.readme
-  %article.file-holder.readme-holder
-    .file-title
-      = blob_icon readme.mode, readme.name
-      = link_to namespace_project_blob_path(@project.namespace, @project, tree_join(@repository.root_ref, readme.name)) do
-        %strong
-          = readme.name
+  %article.readme-holder
+    .pull-right
+      - if can?(current_user, :push_code, @project)
+        = link_to icon('pencil'), namespace_project_edit_blob_path(@project.namespace, @project, tree_join(@repository.root_ref, readme.name)), class: 'light edit-project-readme'
     .file-content.wiki
       = cache(readme_cache_key) do
         = render_readme(readme)