Show committer names in pipeline heading

This is a quick fix I made for one of my projects at work to make the names of committers appear in the pipeline heading. Before applying this change, the pipeline headings look like this:
![pipeline_without_patch](https://cloud.githubusercontent.com/assets/7282099/2711705/a51fab24-c4d0-11e3-82d2-49d9a8b064fe.png)

With the patch, they look like this, which I consider much more informative:
![pipeline_with_patch](https://cloud.githubusercontent.com/assets/7282099/2711720/cecf9cea-c4d0-11e3-99a7-6a79fc8f0e29.png)