Results 3 issues of Ivan

This is most likely upstream issue but cumulative acknowledgement doesn't seem to be working when subscribed to multiple topics.

![install_ext_1](https://cloud.githubusercontent.com/assets/2411422/15265838/37150d2e-195e-11e6-8aa7-9de81418486d.png) ![install_ext_2](https://cloud.githubusercontent.com/assets/2411422/15265841/3a547e70-195e-11e6-8648-28e2c2709ecc.png) ![image](https://cloud.githubusercontent.com/assets/2411422/15265900/df27964c-1960-11e6-9327-b4f30b9c4545.png) ![image](https://cloud.githubusercontent.com/assets/2411422/15265986/975537c2-1963-11e6-8ece-97910cded4da.png) ![image](https://cloud.githubusercontent.com/assets/2411422/15800791/2c719b7c-2a51-11e6-9e04-448f31e60ff4.png)

Our private github repo is triggering Strider every time someone creates pull request. If pull request can be successfully merged everything works well but if there is a merge conflict...

bug