Add Outer Planets Mod from Kerbal Stuff

This pull request was automatically generated by Kerbal Stuff on behalf of CaptRobau, to add [Outer Planets Mod](https://kerbalstuff.com/mod/437/Outer%20Planets%20Mod) to CKAN.

Please direct questions about this pull request to [CaptRobau](https://kerbalstuff.com/profile/CaptRobau).