Cluster health message added. 

fixes: #1044 

![screen shot 2014-07-24 at 12 19 01 pm](https://cloud.githubusercontent.com/assets/748527/3691224/4cf460f6-1350-11e4-8e19-37f95e0a0036.png)

![screen shot 2014-07-24 at 12 23 57 pm](https://cloud.githubusercontent.com/assets/748527/3691226/5071f7d4-1350-11e4-8b99-ce7ae4f04154.png)


One small thing to check is that the output from this endpoint hasn't changed between versions. I think we support as far back at 0.9.0 (or maybe earlier?). I doubt it has changed but worth checking just in case since they have made some backwards-incompatible changes in the past.