permalink for stages

![screen shot 2014-10-10 at 5 15 44 pm](https://cloud.githubusercontent.com/assets/11367/4600737/d873234c-50db-11e4-82bf-97af0f52439e.png)

solves https://github.com/zendesk/samson/issues/127

@steved555 @pswadi-zendesk @princemaple 

### Risks
 - bookmarks breaking