Remove old groovy stacks & update branch names

- Groovy: remove of 3 old (unmaintained) stacks, and replace with new one.
- Hydro & Indigo: Fix wrong branch name in Indigo; now we'll use the same upstream branch for both releases as long as it's possible. 
It's fine to add them to the index. However if they haven't been tested I would suggest sticking with the old ones where were tested there. If you're using the old version of ROS it's expected not to get the latest version of every package.  Or removing them if they're not supported at this point is fine too.