Users can comment on pipeline run history.

Each pipeline run can have a single comment written next to it. This can be used to share failure information among teams looking at the pipelines without needing to review the logs.

Viewing comments, note the different button text:
![screen shot 2014-11-06 at 5 23 11 pm](https://cloud.githubusercontent.com/assets/24275/4947033/fff7802e-661c-11e4-9476-e49030c815ec.png)

Editing a comment:
![screen shot 2014-11-06 at 5 23 42 pm](https://cloud.githubusercontent.com/assets/24275/4947034/02615718-661d-11e4-8301-b0643a727248.png)
`pipelineLabel` is unique but they might contain dots i.e. `.` and this might not work well when you do `'#comment-form-14.3.0'`. You can replace the dots with somethingelse for work around or use something totally different.