Feature Request: Remove all redundant groups
Not sure if this is the right way to call it, but what I mean is to delete all nested groups which are unnecessary.
See example:
![screen shot 2016-12-21 at 12 12 34 pm](https://cloud.githubusercontent.com/assets/13418616/21385351/d382dd82-c776-11e6-9f8c-4c4f259ca7fd.png)