Move to v3.0 of SkyScan (#72)

* v3.0 initial commit ✈️

* add occlusion mapper dir

* more specific image versions

Merge pull request #67 from meadej/stable

Stability updates

Merge pull request #19 from IQTLabs/update_v2

Update v2

small tweaks

- we didn't need the double call to cleanobservations()