Merge branch '20101-ci-configuration' into 'master'

Resolve ""CI configuration" button when `.gitlab-ci.yml` is present"

## What does this MR do?
Adds `CI configuration` button to project overview page

## What are the relevant issue numbers?
Closes #20101

## Screenshots (if relevant)
![Screen_Shot_2016-07-28_at_11.51.32_AM](/uploads/499d942d203d287ae98b7589ef12673c/Screen_Shot_2016-07-28_at_11.51.32_AM.png)



See merge request !5558

CHANGELOG

@@ -41,6 +41,7 @@ v 8.11.0 (unreleased)
   - Profile requests when a header is passed
   - Avoid calculation of line_code and position for _line partial when showing diff notes on discussion tab.
   - Add commit stats in commit api. !5517 (dixpac)
+  - Add CI configuration button on project page
   - Make error pages responsive (Takuya Noguchi)
   - Change requests_profiles resource constraint to catch virtually any file
   - Reduce number of queries made for merge_requests/:id/diffs

app/helpers/projects_helper.rb

@@ -263,6 +263,10 @@ module ProjectsHelper
     filename_path(project, :version)
   end
 
+  def ci_configuration_path(project)
+    filename_path(project, :gitlab_ci_yml)
+  end
+
   def project_wiki_path_with_version(proj, page, version, is_newest)
     url_params = is_newest ? {} : { version_id: version }
     namespace_project_wiki_path(proj.namespace, proj, page, url_params)

app/views/projects/show.html.haml

@@ -43,6 +43,10 @@
       %li
         = link_to 'Contribution guide', contribution_guide_path(@project)
 
+    - if @repository.gitlab_ci_yml
+      %li
+        = link_to 'CI configuration', ci_configuration_path(@project)
+
     - if current_user && can_push_branch?(@project, @project.default_branch)
       - unless @repository.changelog
         %li.missing