Add config file for landscape.io (#392)
Add config file for landscape.io (#392)

Landscape checks code quality and can report back to our PRs.
It's a good target to have and try to fix anything they find.
Sometimes they can detect errors that aren't covered by our tests,
particularly in old code.
rafaelmds/fatiando,rafaelmds/fatiando,cmeessen/fatiando,santis19/fatiando,fatiando/fatiando,cmeessen/fatiando,fatiando/fatiando,santis19/fatiando,drandykass/fatiando,drandykass/fatiando