Merge branch 'generic-commit-status-curve' into 'master'

Add curve to generic commit status pipeline

#### What does this MR do?
Add curve to generic commit status pipeline

#### Screenshots (if relevant)
Before:
 ![Screen_Shot_2016-09-01_at_1.35.29_PM](/uploads/e4585462d50d426bcad66ae571387ddc/Screen_Shot_2016-09-01_at_1.35.29_PM.png)
After:    
![Screen_Shot_2016-09-01_at_1.35.21_PM](/uploads/fe62a7e5fc27c9c1bb3553fdc63c5cc6/Screen_Shot_2016-09-01_at_1.35.21_PM.png)

See merge request !6156

app/views/projects/generic_commit_statuses/_generic_commit_status_pipeline.html.haml

 %li.build
+  .curve
   .build-content
     - if subject.target_url
       - link_to subject.target_url do