Use relative path for extra files
Use relative path for extra files

Fix #220

Juanlu001/poliastro,anhiga/poliastro,newlawrence/poliastro,poliastro/poliastro,anhiga/poliastro,newlawrence/poliastro,newlawrence/poliastro,Juanlu001/poliastro,anhiga/poliastro,Juanlu001/poliastro